NuttX Source: https://github.com/apache/nuttx/tree/4bb30ab0c136dc36182cf43995337fc1d44f0a37
NuttX Apps: https://github.com/apache/nuttx-apps/tree/5a4e9e4389264522d02dae78bcb3f9813743300f

- Ready to Boot CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize

nx_start: Entry
up_allocate_heap: heap_start=0x0x402c4000, heap_size=0x7d3c000
gic_validate_dist_version: GICv3 version detect
gic_validate_dist_version: GICD_TYPER = 0x37a0007
gic_validate_dist_version: 224 SPIs implemented
gic_validate_dist_version: 0 Extended SPIs implemented
gic_validate_dist_version: Distributor has no Range Selector support
gic_validate_redist_version: GICD_TYPER = 0x1000011
gic_validate_redist_version: 16 PPIs implemented
gic_validate_redist_version: no VLPI support, no direct LPI support
up_timer_initialize: up_timer_initialize: cp15 timer(s) running at 62.50MHz, cycle 62500
uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
work_start_highpri: Starting high-priority kernel worker thread(s)
nx_start_application: Starting init thread
lib_cxx_initialize: _sinit: 0x402a7000 _einit: 0x402a7000 _stext: 0x40280000 _etext: 0x402a8000
nsh: sysinit: fopen failed: 2
nsh: mkfatfs: command not found

NuttShell (NSH) NuttX-10.3.0-RC2
nsh> nx_start: CPU0: Beginning Idle Loop

nsh> help
help usage:  help [-v] [<cmd>]

  .         cd        dmesg     help      mount     rmdir     true      xd        
  [         cp        echo      hexdump   mv        set       truncate  
  ?         cmp       exec      kill      printf    sleep     uname     
  basename  dirname   exit      ls        ps        source    umount    
  break     dd        false     mkdir     pwd       test      unset     
  cat       df        free      mkrd      rm        time      usleep    

Builtin Apps:
  getprime  hello     nsh       ostest    sh        

nsh> uname -a
NuttX 10.3.0-RC2 1e8f2a8 Aug 23 2022 07:04:54 arm64 qemu-a53

nsh> hello
task_spawn: name=hello entry=0x4029b594 file_actions=0x402c9580 attr=0x402c9588 argv=0x402c96d0
spawn_execattrs: Setting policy=2 priority=100 for pid=3
Hello, World!!

nsh> ls /
/:
 dev/
 etc/
 proc/

nsh> ls /dev
/dev:
 console
 null
 ram0
 ram2
 ttyS0
 zero

nsh> ls /proc
/proc:
 0/
 1/
 2/
 meminfo
 memdump
 fs/
 self/
 uptime
 version

nsh> ls /etc
/etc:
 init.d/

nsh> ls /etc/init.d
/etc/init.d:
 rcS

nsh> cat /etc/init.d/rcS
# Create a RAMDISK and mount it at /tmp

mkrd -m 2 -s 512 1024
mkfatfs /dev/ram2
mount -t vfat /dev/ram2 /tmp

- Ready to Boot CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize

[CPU0] psci_detect: Detected PSCI v1.1
[CPU0] nx_start: Entry
[CPU0] up_allocate_heap: heap_start=0x0x402db000, heap_size=0x7d25000
[CPU0] gic_validate_dist_version: GICv3 version detect
[CPU0] gic_validate_dist_version: GICD_TYPER = 0x37a0007
[CPU0] gic_validate_dist_version: 224 SPIs implemented
[CPU0] gic_validate_dist_version: 0 Extended SPIs implemented
[CPU0] gic_validate_dist_version: Distributor has no Range Selector support
[CPU0] gic_validate_redist_version: GICD_TYPER = 0x1000001
[CPU0] gic_validate_redist_version: 16 PPIs implemented
[CPU0] gic_validate_redist_version: no VLPI support, no direct LPI support
[CPU0] up_timer_initialize: up_timer_initialize: cp15 timer(s) running at 62.50MHz, cycle 62500
[CPU0] uart_register: Registering /dev/console
[CPU0] uart_register: Registering /dev/ttyS0

- Ready to Boot CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize

[CPU1] gic_validate_redist_version: GICD_TYPER = 0x101000101
[CPU1] gic_validate_redist_version: 16 PPIs implemented
[CPU1] gic_validate_redist_version: no VLPI support, no direct LPI support
[CPU1] nx_idle_trampoline: CPU1: Beginning Idle Loop
[CPU0] arm64_start_cpu: Secondary CPU core 1 (MPID:0x1) is up

- Ready to Boot CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize

[CPU2] gic_validate_redist_version: GICD_TYPER = 0x201000201
[CPU2] gic_validate_redist_version: 16 PPIs implemented
[CPU2] gic_validate_redist_version: no VLPI support, no direct LPI support
[CPU2] nx_idle_trampoline: CPU2: Beginning Idle Loop
[CPU0] arm64_start_cpu: Secondary CPU core 2 (MPID:0x2) is up

- Ready to Boot CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize

[CPU3] gic_validate_redist_version: GICD_TYPER = 0x301000311
[CPU3] gic_validate_redist_version: 16 PPIs implemented
[CPU3] gic_validate_redist_version: no VLPI support, no direct LPI support
[CPU0] arm64_start_cpu: Secondary CPU core 3 (MPID:0x3) is up
[CPU0] work_start_highpri: Starting high-priority kernel worker thread(s)
[CPU0] nx_start_application: Starting init thread
[CPU3] nx_idle_trampoline: CPU3: Beginning Idle Loop
[CPU0] nx_start: CPU0: Beginning Idle Loop

nsh: sysinit: fopen failed: 2
nsh: mkfatfs: command not found

NuttShell (NSH) NuttX-10.3.0-RC2
nsh> help
help usage:  help [-v] [<cmd>]

  .         cd        dmesg     help      mount     rmdir     true      xd        
  [         cp        echo      hexdump   mv        set       truncate  
  ?         cmp       exec      kill      printf    sleep     uname     
  basename  dirname   exit      ls        ps        source    umount    
  break     dd        false     mkdir     pwd       test      unset     
  cat       df        free      mkrd      rm        time      usleep    

Builtin Apps:
  getprime  hello     nsh       ostest    sh        smp       taskset   

nsh> uname -a
NuttX 10.3.0-RC2 1e8f2a8 Aug 21 2022 15:57:35 arm64 qemu-a53

nsh> hello
[CPU0] task_spawn: name=hello entry=0x4029cee4 file_actions=0x402e52b0 attr=0x402e52b8 argv=0x402e5400
[CPU0] spawn_execattrs: Setting policy=2 priority=100 for pid=6
Hello, World!

40280000 4d 5a 00 91     add        x13,x18,#0x16
40280004 0f 00 00 14     b          real_start

    /* Kernel startup entry point.
     * ---------------------------
     *
     * The requirements are:
     *   MMU = off, D-cache = off, I-cache = on or off,
     *   x0 = physical address to the FDT blob.
     *       it will be used when NuttX support device tree in the future
     *
     * This must be the very first address in the loaded image.
     * It should be loaded at any 4K-aligned address.
     */
    .globl __start;
__start:

    /* DO NOT MODIFY. Image header expected by Linux boot-loaders.
     *
     * This add instruction has no meaningful effect except that
     * its opcode forms the magic "MZ" signature of a PE/COFF file
     * that is required for UEFI applications.
     *
     * Some bootloader (such imx8 uboot) checking the magic "MZ" to see
     * if the image is a valid Linux image. but modifying the bootLoader is
     * unnecessary unless we need to do a customize secure boot.
     * so just put the ''MZ" in the header to make bootloader happiness
     */

    add     x13, x18, #0x16      /* the magic "MZ" signature */
    b       real_start           /* branch to kernel start */
    .quad   0x480000              /* Image load offset from start of RAM */
    .quad   _e_initstack - __start         /* Effective size of kernel image, little-endian */
    .quad   __HEAD_FLAGS         /* Informative flags, little-endian */
    .quad   0                    /* reserved */
    .quad   0                    /* reserved */
    .quad   0                    /* reserved */
    .ascii  "ARM\x64"            /* Magic number, "ARM\x64" */
    .long   0                    /* reserved */

real_start:
    /* Disable all exceptions and interrupts */

u32 code0;                    /* Executable code */
u32 code1;                    /* Executable code */
u64 text_offset;              /* Image load offset, little endian */
u64 image_size;               /* Effective Image size, little endian */
u64 flags;                    /* kernel flags, little endian */
u64 res2      = 0;            /* reserved */
u64 res3      = 0;            /* reserved */
u64 res4      = 0;            /* reserved */
u32 magic     = 0x644d5241;   /* Magic number, little endian, "ARM\x64" */
u32 res5;                     /* reserved (used for PE COFF offset) */

    .quad   0x480000              /* Image load offset from start of RAM */

CONFIG_RAM_SIZE=134217728
CONFIG_RAM_START=0x40000000

SECTIONS
{
  . = 0x40280000;  /* uboot load address */
  _start = .;

SECTIONS
{
SECTIONS
{
  . = 0x40080000;  /* PinePhone uboot load address (kernel_addr_r) */
  /* Previously: . = 0x40280000; */  /* uboot load address */
  _start = .;

    .quad   0x0000               /* PinePhone Image load offset from start of RAM */
    # Previously: .quad   0x480000              /* Image load offset from start of RAM */

/* TODO: Increase to 2 GB for PinePhone */
CONFIG_RAM_SIZE=134217728
CONFIG_RAM_START=0x40000000

nx_start_application: Starting init thread
lib_cxx_initialize: _sinit: 0x400e9000 _einit: 0x400e9000
nsh: sysinit: fopen failed: 2
nshn:x _msktfaarttf:s :C PcUo0m:m aBnedg innonti nfgo uInddleLoNouptt
Shell (NSH) NuttX-11.0.0-RC2

nsh: sysinit: fopen failed: 2
nsh: mkfatfs: command not found
NuttShell (NSH) NuttX-11.0.0-RC2
nsh> nx_start: CPU0: Beginning Idle Loop

nx_start_application: Starting init thread
lib_cxx_initialize: _sinit: 0x400e9000 _einit: 0x400e9000
{{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{n}s}h{:} {s}y{s}i{n}i{t}:{ }f{o}p{e}n{ }f{a}i{l}e{d}:{ }2{
}
{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{}{{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{{}}{n}s}h{:} {m{k}f}a{t}f{s{:} }c{o{m}m}a{n{d} }n{o{t} }f{o{u}n}d{

void flockfile(FAR struct file_struct *stream)
{
  nxrmutex_lock(&stream->fs_lock);
  _info("%p, thread=%d, mutex.count=%d\n", stream, gettid(), stream->fs_lock.count); // Log the Thread ID and Mutex Count
}

void funlockfile(FAR struct file_struct *stream)
{
  _info("%p, thread=%d, mutex.count=%d\n", stream, gettid(), stream->fs_lock.count); // Log the Thread ID and Mutex Count
  nxrmutex_unlock(&stream->fs_lock);
}

lib_cxx_initialize: _sinit: 0x400e9000 _einit: 0x400e9000
flockfile: 0x40a5cc78, thread=2, mutex.count=1
flockfile: 0x40a5cc78, thread=2, mutex.count=2
flockfile: 0x40a5cc78, thread=2, mutex.count=3
funlockfile: 0x40a5cc78, thread=2, mutex.count=3
funlockfile: 0x40a5cc78, thread=2, mutex.count=2

up_setup: Enter DLAB=1
up_serialout: addr=0x1c2800c, before=0x3, after=0x83
up_setup: Set the BAUD divisor
up_serialout: addr=0x1c28004, before=0x0, after=0x0
up_serialout: addr=0x1c28000, before=0x0, after=0xd
up_setup: Clear DLAB
up_serialout: addr=0x1c2800c, before=0x3, after=0x3

up_serialout: addr=0x1c28000, before=0x0, after=0xd
// For UART0: Before should be 0xd

up_setup: Enter DLAB=1
up_serialout: addr=0x1c2800c, before=0x3, after=0x83
...
up_setup: Clear DLAB
up_serialout: addr=0x1c2800c, before=0x3, after=0x3
// Before should be 0x83, not 0x3

$ screen /dev/ttyUSB0 115200

DRAM: 2048 MiB
Trying to boot from MMC1
NOTICE:  BL31: v2.2(release):v2.2-904-gf9ea3a629
NOTICE:  BL31: Built : 15:32:12, Apr  9 2020
NOTICE:  BL31: Detected Allwinner A64/H64/R18 SoC (1689)
NOTICE:  BL31: Found U-Boot DTB at 0x4064410, model: PinePhone
NOTICE:  PSCI: System suspend is unavailable

U-Boot 2020.07 (Nov 08 2020 - 00:15:12 +0100)

DRAM:  2 GiB
MMC:   Device 'mmc@1c11000': seq 1 is in use by 'mmc@1c10000'
mmc@1c0f000: 0, mmc@1c10000: 2, mmc@1c11000: 1
Loading Environment from FAT... *** Warning - bad CRC, using default environment

starting USB...
No working controllers found
Hit any key to stop autoboot:

=> help
?         - alias for 'help'
base      - print or set address offset
bdinfo    - print Board Info structure
blkcache  - block cache diagnostics and control
boot      - boot default, i.e., run 'bootcmd'
bootd     - boot default, i.e., run 'bootcmd'
bootelf   - Boot from an ELF image in memory
booti     - boot Linux kernel 'Image' format from memory
bootm     - boot application image from memory
bootvx    - Boot vxWorks from an ELF image
cmp       - memory compare
coninfo   - print console devices and information
cp        - memory copy
crc32     - checksum calculation
dm        - Driver model low level access
echo      - echo args to console
editenv   - edit environment variable
env       - environment handling commands
exit      - exit script
ext2load  - load binary file from a Ext2 filesystem
ext2ls    - list files in a directory (default /)
ext4load  - load binary file from a Ext4 filesystem
ext4ls    - list files in a directory (default /)
ext4size  - determine a file's size
false     - do nothing, unsuccessfully
fatinfo   - print information about filesystem
fatload   - load binary file from a dos filesystem
fatls     - list files in a directory (default /)
fatmkdir  - create a directory
fatrm     - delete a file
fatsize   - determine a file's size
fatwrite  - write file into a dos filesystem
fdt       - flattened device tree utility commands
fstype    - Look up a filesystem type
go        - start application at address 'addr'
gpio      - query and control gpio pins
gpt       - GUID Partition Table
gzwrite   - unzip and write memory to block device
help      - print command description/usage
iminfo    - print header information for application image
imxtract  - extract a part of a multi-image
itest     - return true/false on integer compare
ln        - Create a symbolic link
load      - load binary file from a filesystem
loadb     - load binary file over serial line (kermit mode)
loads     - load S-Record file over serial line
loadx     - load binary file over serial line (xmodem mode)
loady     - load binary file over serial line (ymodem mode)
loop      - infinite loop on address range
ls        - list files in a directory (default /)
lzmadec   - lzma uncompress a memory region
md        - memory display
mm        - memory modify (auto-incrementing address)
mmc       - MMC sub system
mmcinfo   - display MMC info
mw        - memory write (fill)
nm        - memory modify (constant address)
part      - disk partition related commands
poweroff  - Perform POWEROFF of the device
printenv  - print environment variables
random    - fill memory with random pattern
reset     - Perform RESET of the CPU
run       - run commands in an environment variable
save      - save file to a filesystem
saveenv   - save environment variables to persistent storage
setenv    - set environment variables
setexpr   - set environment variable as the result of eval expression
sf        - SPI flash sub-system
showvar   - print local hushshell variables
size      - determine a file's size
sleep     - delay execution for some time
source    - run script from memory
sysboot   - command to get and boot from syslinux files
test      - minimal test like /bin/sh
true      - do nothing, successfully
unlz4     - lz4 uncompress a memory region
unzip     - unzip a memory region
usb       - USB sub-system
usbboot   - boot from USB device
version   - print monitor, compiler and linker version

=> printenv
arch=arm
baudrate=115200
board=sunxi
board_name=sunxi
boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}
boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}${boot_syslinux_conf}
boot_net_usb_start=usb start
boot_prefixes=/ /boot/
boot_script_dhcp=boot.scr.uimg
boot_scripts=boot.scr.uimg boot.scr
boot_syslinux_conf=extlinux/extlinux.conf
boot_targets=fel mmc_auto usb0 
bootcmd=run distro_bootcmd
bootcmd_fel=if test -n ${fel_booted} && test -n ${fel_scriptaddr}; then echo '(FEL boot)'; source ${fel_scriptaddr}; fi
bootcmd_mmc0=devnum=0; run mmc_boot
bootcmd_mmc1=devnum=1; run mmc_boot
bootcmd_mmc_auto=if test ${mmc_bootdev} -eq 1; then run bootcmd_mmc1; run bootcmd_mmc0; elif test ${mmc_bootdev} -eq 0; then run bootcmd_mmc0; run bootcmd_mmc1; fi
bootcmd_usb0=devnum=0; run usb_boot
bootdelay=0
bootm_size=0xa000000
console=ttyS0,115200
cpu=armv8
dfu_alt_info_ram=kernel ram 0x40080000 0x1000000;fdt ram 0x4FA00000 0x100000;ramdisk ram 0x4FE00000 0x4000000
distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done
ethaddr=02:ba:8c:73:bf:ca
fdt_addr_r=0x4FA00000
fdtcontroladdr=bbf4dd40
fdtfile=allwinner/sun50i-a64-pinephone.dtb
kernel_addr_r=0x40080000
mmc_boot=if mmc dev ${devnum}; then devtype=mmc; run scan_dev_for_boot_part; fi
mmc_bootdev=0
partitions=name=loader1,start=8k,size=32k,uuid=${uuid_gpt_loader1};name=loader2,size=984k,uuid=${uuid_gpt_loader2};name=esp,size=128M,bootable,uuid=${uuid_gpt_esp};name=system,size=-,uuid=${uuid_gpt_system};
preboot=usb start
pxefile_addr_r=0x4FD00000
ramdisk_addr_r=0x4FE00000
scan_dev_for_boot=echo Scanning ${devtype} ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run scan_dev_for_scripts; done;
scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable devplist; env exists devplist || setenv devplist 1; for distro_bootpart in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart} bootfstype; then run scan_dev_for_boot; fi; done; setenv devplist
scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${boot_syslinux_conf}; then echo Found ${prefix}${boot_syslinux_conf}; run boot_extlinux; echo SCRIPT FAILED: continuing...; fi
scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${script}; then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fi; done�
scriptaddr=0x4FC00000
serial#=92c07dba8c73bfca
soc=sunxi
stderr=serial@1c28000
stdin=serial@1c28000
stdout=serial@1c28000
usb_boot=usb start; if usb dev ${devnum}; then devtype=usb; run scan_dev_for_boot_part; fi
uuid_gpt_esp=c12a7328-f81f-11d2-ba4b-00a0c93ec93b
uuid_gpt_system=b921b045-1df0-41c3-af44-4c6f280d3fae

Environment size: 2861/131068 bytes

=> boot
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
Found U-Boot script /boot.scr
653 bytes read in 3 ms (211.9 KiB/s)
## Executing script at 4fc00000
gpio: pin 114 (gpio 114) value is 1
4275261 bytes read in 192 ms (21.2 MiB/s)
Uncompressed size: 10170376 = 0x9B3008
36162 bytes read in 4 ms (8.6 MiB/s)
1078500 bytes read in 51 ms (20.2 MiB/s)
## Flattened Device Tree blob at 4fa00000
   Booting using the fdt blob at 0x4fa00000
   Loading Ramdisk to 49ef8000, end 49fff4e4 ... OK
   Loading Device Tree to 0000000049eec000, end 0000000049ef7d41 ... OK

Starting kernel ...

/ # 

/* PL011 UART transmit character
 * xb: register which contains the UART base address
 * wt: register which contains the character to transmit
 */

.macro early_uart_transmit xb, wt
    strb  \wt, [\xb]             /* -> UARTDR (Data Register) */
.endm

 /* 32-bit register definition for qemu pl011 uart */

 /* PinePhone Allwinner A64 UART0 Base Address: */
 #define UART1_BASE_ADDRESS 0x01C28000
 /* Previously: #define UART1_BASE_ADDRESS 0x9000000 */
 #define EARLY_UART_PL011_BAUD_RATE  115200

/* PL011 UART wait UART to be ready to transmit
 * xb: register which contains the UART base address
 * c: scratch register number
 */

.macro early_uart_ready xb, wt
1:
    # TODO: Wait for PinePhone Allwinner A64 UART
    # ldrh  \wt, [\xb, #0x18]      /* <- UARTFR (Flag register) */
    # tst   \wt, #0x8              /* Check BUSY bit */
    # b.ne  1b                     /* Wait for the UART to be ready */
.endm

/* PL011 UART initialization
 * xb: register which contains the UART base address
 * c: scratch register number
 */

GTEXT(up_earlyserialinit)
SECTION_FUNC(text, up_earlyserialinit)
    # TODO: Set PinePhone Allwinner A64 Baud Rate Divisor: UART_LCR (DLAB), UART_DLL, UART_DLH
    # ldr   x15, =UART1_BASE_ADDRESS
    # mov   x0, #(7372800 / EARLY_UART_PL011_BAUD_RATE % 16)
    # strh  w0, [x15, #0x28]      /* -> UARTFBRD (Baud divisor fraction) */
    # mov   x0, #(7372800 / EARLY_UART_PL011_BAUD_RATE / 16)
    # strh  w0, [x15, #0x24]      /* -> UARTIBRD (Baud divisor integer) */
    # mov   x0, #0x60             /* 8n1 */
    # str   w0, [x15, #0x2C]      /* -> UARTLCR_H (Line control) */
    # ldr   x0, =0x00000301       /* RXE | TXE | UARTEN */
    # str   w0, [x15, #0x30]      /* -> UARTCR (Control Register) */
    ret

DRAM: 2048 MiB
Trying to boot from MMC1
NOTICE:  BL31: v2.2(release):v2.2-904-gf9ea3a629
NOTICE:  BL31: Built : 15:32:12, Apr  9 2020
NOTICE:  BL31: Detected Allwinner A64/H64/R18 SoC (1689)
NOTICE:  BL31: Found U-Boot DTB at 0x4064410, model: PinePhone
NOTICE:  PSCI: System suspend is unavailable

U-Boot 2020.07 (Nov 08 2020 - 00:15:12 +0100)

DRAM:  2 GiB
MMC:   Device 'mmc@1c11000': seq 1 is in use by 'mmc@1c10000'
mmc@1c0f000: 0, mmc@1c10000: 2, mmc@1c11000: 1
Loading Environment from FAT... *** Warning - bad CRC, using default environment

starting USB...
No working controllers found
Hit any key to stop autoboot:  0 
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
Found U-Boot script /boot.scr
653 bytes read in 3 ms (211.9 KiB/s)
## Executing script at 4fc00000
gpio: pin 114 (gpio 114) value is 1
99784 bytes read in 8 ms (11.9 MiB/s)
Uncompressed size: 278528 = 0x44000
36162 bytes read in 4 ms (8.6 MiB/s)
1078500 bytes read in 51 ms (20.2 MiB/s)
## Flattened Device Tree blob at 4fa00000
   Booting using the fdt blob at 0x4fa00000
   Loading Ramdisk to 49ef8000, end 49fff4e4 ... OK
   Loading Device Tree to 0000000049eec000, end 0000000049ef7d41 ... OK

Starting kernel ...

HELLO NUTTX ON PINEPHONE!
- Ready to Boot CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize
nx_start: Entry
up_allocate_heap: heap_start=0x0x400c4000, heap_size=0x7f3c000
arm64_gic_initialize: TODO: Init GIC for PinePhone
arm64_gic_initialize: CONFIG_GICD_BASE=0x1c81000
arm64_gic_initialize: CONFIG_GICR_BASE=0x1c82000
arm64_gic_initialize: GIC Version is 2
up_timer_initialize: up_timer_initialize: cp15 timer(s) running at 24.00MHz, cycle 24000
up_timer_initialize: _vector_table=0x400a7000
up_timer_initialize: Before writing: vbar_el1=0x40227000
up_timer_initialize: After writing: vbar_el1=0x400a7000
uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
work_start_highpri: Starting high-priority kernel worker thread(s)
nx_start_application: Starting init thread
lib_cxx_initialize: _sinit: 0x400a7000 _einit: 0x400a7000 _stext: 0x40080000 _etext: 0x400a8000
nsh: sysinit: fopen failed: 2
nshn:x _msktfaarttf:s :C PcUo0m:m aBnedg innonti nfgo uInddle  L oNouptt
 Shell (NSH) NuttX-10.3.0-RC2

nsh> uname -a
NuttX 10.3.0-RC2 fc909c6-dirty Sep  1 2022 17:05:44 arm64 qemu-a53

nsh> help
help usage:  help [-v] [<cmd>]

  .         cd        dmesg     help      mount     rmdir     true      xd        
  [         cp        echo      hexdump   mv        set       truncate  
  ?         cmp       exec      kill      printf    sleep     uname     
  basename  dirname   exit      ls        ps        source    umount    
  break     dd        false     mkdir     pwd       test      unset     
  cat       df        free      mkrd      rm        time      usleep    

Builtin Apps:
  getprime  hello     nsh       ostest    sh        

nsh> hello
task_spawn: name=hello entry=0x4009b1a0 file_actions=0x400c9580 attr=0x400c9588 argv=0x400c96d0
spawn_execattrs: Setting policy=2 priority=100 for pid=3
Hello, World!!

nsh> ls /dev
/dev:
 console
 null
 ram0
 ram2
 ttyS0
 zero

arm64_gic_initialize: TODO: Init GIC for PinePhone
arm64_gic_initialize: CONFIG_GICD_BASE=0x1c81000
arm64_gic_initialize: CONFIG_GICR_BASE=0x1c82000
arm64_gic_initialize: GIC Version is 2

arm64_gic_initialize: TODO: Init GIC for PinePhone
arm64_gic_initialize: CONFIG_GICD_BASE=0x1c81000
arm64_gic_initialize: CONFIG_GICR_BASE=0x1c82000
arm64_gic_initialize: GIC Version is 2
up_timer_initialize: up_timer_initialize: cp15 timer(s) running at 24.00MHz, cycle 24000
uart_regi

up_timer_initialize: up_timer_initialize: cp15 timer(s) running at 24.00MHz, cycle 24000
up_timer_initialize: _vector_table=0x400a7000
up_timer_initialize: Before writing: vbar_el1=0x40227000

up_timer_initialize: up_timer_initialize: cp15 timer(s) running at 24.00MHz, cycle 24000
up_timer_initialize: _vector_table=0x400a7000
up_timer_initialize: Before writing: vbar_el1=0x40227000
up_timer_initialize: After writing: vbar_el1=0x400a7000

- Ready to Boot CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize
nx_start: Entry
up_allocate_heap: heap_start=0x0x402c4000, heap_size=0x7d3c000
arm64_gic_initialize: TODO: Init GIC for PinePhone
arm64_gic_initialize: CONFIG_GICD_BASE=0x8000000
arm64_gic_initialize: CONFIG_GICR_BASE=0x8010000
arm64_gic_initialize: GIC Version is 2
EFGHup_timer_initialize: up_timer_initialize: cp15 timer(s) running at 62.50MHz, cycle 62500
AKLMNOPBIJuart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
AKLMNOPBIJwork_start_highpri: Starting high-priority kernel worker thread(s)
nx_start_application: Starting init thread
lib_cxx_initialize: _sinit: 0x402a7000 _einit: 0x402a7000 _stext: 0x40280000 _etext: 0x402a8000
nsh: sysinit: fopen failed: 2
nsh: mkfatfs: command not found

NuttShell (NSH) NuttX-10.3.0-RC2
nsh> nx_start: CPU0: Beginning Idle Loop

arm64_gic_initialize: CONFIG_GICD_BASE=0x8000000
arm64_gic_initialize: CONFIG_GICR_BASE=0x8010000

intc@8000000 {
reg = <
    0x00 0x8000000 0x00 0x10000  //  GIC Distributor:   0x8000000
    0x00 0x8010000 0x00 0x10000  //  GIC CPU Interface: 0x8010000
    0x00 0x8030000 0x00 0x10000  //  VGIC Virtual Interface Control: 0x8030000
    0x00 0x8040000 0x00 0x10000  //  VGIC Virtual CPU Interface:     0x8040000
>;
compatible = "arm,cortex-a15-gic";

intc@8000000 {
reg = <
    0x00 0x8000000 0x00 0x10000   //  GIC Distributor:   0x8000000
    0x00 0x80a0000 0x00 0xf60000  //  GIC CPU Interface: 0x80a0000
>;
#redistributor-regions = <0x01>;
compatible = "arm,gic-v3";

    PRINT(switch_el1, "- Boot from EL1\r\n")

    /* EL1 init */
    bl    arm64_boot_el1_init

    /* set SP_ELx and Enable SError interrupts */
    msr   SPSel, #1
    msr   DAIFClr, #(DAIFCLR_ABT_BIT)
    isb

jump_to_c_entry:
    PRINT(jump_to_c_entry, "- Boot to C runtime for OS Initialize\r\n")
    ret x25

HELLO NUTTX ON PINEPHONE!
- Ready to Boot CPU
- Boot from EL2
- Boot from EL1
- Boot to C runtime for OS Initialize

up_timer_initialize: ARM_ARCH_TIMER_IRQ=27
up_timer_initialize: arm64_arch_timer_compare_isr=0x4009ae18
up_timer_initialize: irq_unexpected_isr=0x400820e0

up_timer_initialize: g_irqvector[0].handler=0x400820e0
...
up_timer_initialize: g_irqvector[26].handler=0x400820e0
up_timer_initialize: g_irqvector[27].handler=0x4009ae18
up_timer_initialize: g_irqvector[28].handler=0x400820e0
...
up_timer_initialize: g_irqvector[219].handler=0x400820e0

# PinePhone Allwinner A64 UART0 Base Address
#define UART1_BASE_ADDRESS 0x01C28000

# QEMU UART Base Address
# Previously: #define UART1_BASE_ADDRESS 0x9000000

/****************************************************************************
 * Name: arm64_irq_handler
 * Description:
 *   Interrupt exception handler
 ****************************************************************************/
GTEXT(arm64_irq_handler)
SECTION_FUNC(text, arm64_irq_handler)

    mov   x0, #84                 /* For Debug: 'T' */
    ldr   x1, =UART1_BASE_ADDRESS /* For Debug */
    strb  w0, [x1]                /* For Debug */

    /* switch to IRQ stack and save current sp on it. */
    ...

# PinePhone Allwinner A64 UART0 Base Address
#define UART1_BASE_ADDRESS 0x01C28000

# QEMU UART Base Address
# Previously: #define UART1_BASE_ADDRESS 0x9000000

/* Save Corruptible Registers and exception context
 * on the task stack
 * note: allocate stackframe with XCPTCONTEXT_GP_REGS
 *     which is ARM64_ESF_REGS + ARM64_CS_REGS
 *     but only save ARM64_ESF_REGS
 */
.macro arm64_enter_exception xreg0, xreg1
    sub    sp, sp, #8 * XCPTCONTEXT_GP_REGS

    stp    x0,  x1,  [sp, #8 * REG_X0]
    stp    x2,  x3,  [sp, #8 * REG_X2]
    ...
    stp    x28, x29, [sp, #8 * REG_X28]

    mov   x0, #88                 /* For Debug: 'X' */
    ldr   x1, =UART1_BASE_ADDRESS /* For Debug */
    strb  w0, [x1]                /* For Debug */

nsh_main: ****main
HH: qemu_pl011_txint
nsh_main: ****main3

uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
K: qemu_pl011_attach
G: qemu_pl011_rxint
work_start_highpri: Starting high-priority kernel worker thread(s)
nx_start_application: Starting init thread
lib_cxx_initialize: _sinit: 0x400a7000 _einit: 0x400a7000 _stext: 0x40080000 _etext: 0x400a8000
nsh_main: ****main
puts: A
HH: qemu_pl011_txint
puts: B
nsh_main: ****main3
HHHHHHHHHHHH: qemu_pl011_txint
GG: qemu_pl011_rxint
nx_start: CPU0: Beginning Idle Loop

ph_cfg1_reg=0x7177
ph_data_reg=0x400

pd_cfg2_reg=0x77711177
pd_data_reg=0x1c0000

nsh> hello
task_spawn: name=hello entry=0x4009b1a4 file_actions=0x400c9580 attr=0x400c9588 argv=0x400c96d0
spawn_execattrs: Setting policy=2 priority=100 for pid=3
ABHello, World!!
ph_cfg1_reg=0x7177
ph_data_reg=0x400
pd_cfg2_reg=0x77711177
pd_data_reg=0x1c0000
tcon_gctl_reg=0x80000000
tcon0_3d_fifo_reg=0x80000631
tcon0_ctl_reg=0x80000000
tcon0_basic0_reg=0x630063
tcon0_lvds_if_reg=0x80000000
nsh> 

pd_cfg2_reg=0x77711177
pd_data_reg=0x1c0000

poke &h1C20874, &h77711177

poke &h1C2087C, &h1C0000

poke &h1C2087C, &h0000

nsh> bas
task_spawn: name=bas entry=0x4009b340 file_actions=0x400f3580 attr=0x400f3588 argv=0x400f36d0
spawn_execattrs: Setting policy=2 priority=100 for pid=7
bas 2.4
Copyright 1999-2014 Michael Haardt.
This is free software with ABSOLUTELY NO WARRANTY.

> print peek(&h1C20874)
 2004316535 

> poke &h1C20874, &h77711177

> print peek(&h1C20874)
 2003898743 

> print peek(&h1C2087C)
 262144 

> poke &h1C2087C, &h0000

> print peek(&h1C2087C)
 0 

> poke &h1C2087C, &h1C0000

> print peek(&h1C2087C)
 1835008  

10 'Enable GPIO Output for PD18, PD19 and PD20
20 poke &h1C20874, &h77711177
30 'Turn off GPIOs PD18, PD19 and PD20
40 poke &h1C2087C, &h0
50 sleep 5
60 'Turn on GPIOs PD18, PD19 and PD20
70 poke &h1C2087C, &h1C0000
80 sleep 5
90 goto 40
run

led_daemon: LED set 0x00 (black)
led_daemon: LED set 0x01 (green)
led_daemon: LED set 0x02 (red)
led_daemon: LED set 0x03 (yellow)
led_daemon: LED set 0x04 (blue)
led_daemon: LED set 0x05 (cyan)
led_daemon: LED set 0x06 (magenta)
led_daemon: LED set 0x07 (white)

## Convert Device Tree to text format
dtc \
  -o sun50i-a64-pinephone-1.2.dts \
  -O dts \
  -I dtb \
  sun50i-a64-pinephone-1.2.dtb

lcd-controller@1c0c000 {
  compatible = "allwinner,sun50i-a64-tcon-lcd\0allwinner,sun8i-a83t-tcon-lcd";
  reg = <0x1c0c000 0x1000>;
  interrupts = <0x00 0x56 0x04>;
  clocks = <0x02 0x2f 0x02 0x64>;
  clock-names = "ahb\0tcon-ch0";
  clock-output-names = "tcon-pixel-clock";
  #clock-cells = <0x00>;
  resets = <0x02 0x18 0x02 0x23>;
  reset-names = "lcd\0lvds";

  ports {
    #address-cells = <0x01>;
    #size-cells = <0x00>;

    // TCON0: MIPI DSI Display
    port@0 {
      #address-cells = <0x01>;
      #size-cells = <0x00>;
      reg = <0x00>;

      endpoint@0 {
        reg = <0x00>;
        remote-endpoint = <0x22>;
        phandle = <0x1e>;
      };

      endpoint@1 {
        reg = <0x01>;
        remote-endpoint = <0x23>;
        phandle = <0x20>;
      };
    };

    // TCON1: HDMI
    port@1 { ... };
  };
};

dsi@1ca0000 {
  compatible = "allwinner,sun50i-a64-mipi-dsi";
  reg = <0x1ca0000 0x1000>;
  interrupts = <0x00 0x59 0x04>;
  clocks = <0x02 0x1c>;
  resets = <0x02 0x05>;
  phys = <0x53>;
  phy-names = "dphy";
  status = "okay";
  #address-cells = <0x01>;
  #size-cells = <0x00>;
  vcc-dsi-supply = <0x45>;

  port {

    endpoint {
      remote-endpoint = <0x54>;
      phandle = <0x24>;
    };
  };

  panel@0 {
    compatible = "xingbangda,xbd599";
    reg = <0x00>;
    reset-gpios = <0x2b 0x03 0x17 0x01>;
    iovcc-supply = <0x55>;
    vcc-supply = <0x48>;
    backlight = <0x56>;
  };
};

d-phy@1ca1000 {
  compatible = "allwinner,sun50i-a64-mipi-dphy\0allwinner,sun6i-a31-mipi-dphy";
  reg = <0x1ca1000 0x1000>;
  clocks = <0x02 0x1c 0x02 0x71>;
  clock-names = "bus\0mod";
  resets = <0x02 0x05>;
  status = "okay";
  #phy-cells = <0x00>;
  phandle = <0x53>;
};

backlight {
  compatible = "pwm-backlight";
  pwms = <0x62 0x00 0xc350 0x01>;
  enable-gpios = <0x2b 0x07 0x0a 0x00>;
  power-supply = <0x48>;
  brightness-levels = <0x1388 0x1480 0x1582 0x16e2 0x18c9 0x1b4b 0x1e7d 0x2277 0x274e 0x2d17 0x33e7 0x3bd5 0x44f6 0x4f5f 0x5b28 0x6864 0x7729 0x878e 0x99a7 0xad8b 0xc350>;
  num-interpolated-steps = <0x32>;
  default-brightness-level = <0x1f4>;
  phandle = <0x56>;
};

leds {
  compatible = "gpio-leds";

  blue {
    function = "indicator";
    color = <0x03>;
    gpios = <0x2b 0x03 0x14 0x00>;
    retain-state-suspended;
  };

  green {
    function = "indicator";
    color = <0x02>;
    gpios = <0x2b 0x03 0x12 0x00>;
    retain-state-suspended;
  };

  red {
    function = "indicator";
    color = <0x01>;
    gpios = <0x2b 0x03 0x13 0x00>;
    retain-state-suspended;
  };
};

framebuffer-lcd {
  compatible = "allwinner,simple-framebuffer\0simple-framebuffer";
  allwinner,pipeline = "mixer0-lcd0";
  clocks = <0x02 0x64 0x03 0x06>;
  status = "disabled";
};

display-engine {
  compatible = "allwinner,sun50i-a64-display-engine";
  allwinner,pipelines = <0x07 0x08>;
  status = "okay";
};

touchscreen@5d {
  compatible = "goodix,gt917s";
  reg = <0x5d>;
  interrupt-parent = <0x2b>;
  interrupts = <0x07 0x04 0x04>;
  irq-gpios = <0x2b 0x07 0x04 0x00>;
  reset-gpios = <0x2b 0x07 0x0b 0x00>;
  AVDD28-supply = <0x48>;
  VDDIO-supply = <0x48>;
  touchscreen-size-x = <0x2d0>;
  touchscreen-size-y = <0x5a0>;
};

video-codec@1c0e000 {
  compatible = "allwinner,sun50i-a64-video-engine";
  reg = <0x1c0e000 0x1000>;
  clocks = <0x02 0x2e 0x02 0x6a 0x02 0x5f>;
  clock-names = "ahb\0mod\0ram";
  resets = <0x02 0x17>;
  interrupts = <0x00 0x3a 0x04>;
  allwinner,sram = <0x28 0x01>;
};

gpu@1c40000 {
  compatible = "allwinner,sun50i-a64-mali\0arm,mali-400";
  reg = <0x1c40000 0x10000>;
  interrupts = <0x00 0x61 0x04 0x00 0x62 0x04 0x00 0x63 0x04 0x00 0x64 0x04 0x00 0x66 0x04 0x00 0x67 0x04 0x00 0x65 0x04>;
  interrupt-names = "gp\0gpmmu\0pp0\0ppmmu0\0pp1\0ppmmu1\0pmu";
  clocks = <0x02 0x35 0x02 0x72>;
  clock-names = "bus\0core";
  resets = <0x02 0x1f>;
  assigned-clocks = <0x02 0x72>;
  assigned-clock-rates = <0x1dcd6500>;
};

deinterlace@1e00000 {
  compatible = "allwinner,sun50i-a64-deinterlace\0allwinner,sun8i-h3-deinterlace";
  reg = <0x1e00000 0x20000>;
  clocks = <0x02 0x31 0x02 0x66 0x02 0x61>;
  clock-names = "bus\0mod\0ram";
  resets = <0x02 0x1a>;
  interrupts = <0x00 0x5d 0x04>;
  interconnects = <0x57 0x09>;
  interconnect-names = "dma-mem";
};

nsh> null
HELLO ZIG ON PINEPHONE!

NuttShell (NSH) NuttX-11.0.0-RC2
nsh> uname -a
NuttX 11.0.0-RC2 c938291 Oct  7 2022 16:54:31 arm64 qemu-a53

nsh> null
HELLO ZIG ON PINEPHONE!
Testing Compose Short Packet (Without Parameter)...
composeShortPacket: channel=0, cmd=0x5, len=1
Result:
05 11 00 36 
Testing Compose Short Packet (With Parameter)...
composeShortPacket: channel=0, cmd=0x15, len=2
Result:
15 bc 4e 35 
Testing Compose Long Packet...
composeLongPacket: channel=0, cmd=0x39, len=64
Result:
39 40 00 25 e9 82 10 06 
05 a2 0a a5 12 31 23 37 
83 04 bc 27 38 0c 00 03 
00 00 00 0c 00 03 00 00 
00 75 75 31 88 88 88 88 
88 88 13 88 64 64 20 88 
88 88 88 88 88 02 88 00 
00 00 00 00 00 00 00 00 
00 00 00 00 65 03 

Testing Compose Long Packet...
composeLongPacket: channel=0, cmd=0x39, len=64
Result:
39 40 00 25 e9 82 10 06 
05 a2 0a a5 12 31 23 37 
83 04 bc 27 38 0c 00 03 
00 00 00 0c 00 03 00 00 
00 75 75 31 88 88 88 88 
88 88 13 88 64 64 20 88 
88 88 88 88 88 02 88 00 
00 00 00 00 00 00 00 00 
00 00 00 00 65 03