Small linux bootloader for Allwinner T113-S3

Run make LOG_LEVEL=40.
This will generate the bootloader with a valid EGON header, usable with the xfel tool or BOOTROM
You can change the log level with the LOG_LEVEL argument. Default is 30 (info).

You will need xfel for uploading the file to memory or SPI flash.
This it not needed for writing to an SD card.

xfel write 0x30000 awboot-fel.bin
xfel exec 0x30000

make spi-boot.img
xfel spinor
xfel spinor write 0 spi-boot.img
xfel reset

make spi-boot.img
xfel spi_nand
xfel spi_nand write 0 spi-boot.img
xfel reset

• create an MBR or GPT partition table and a FAT32 partition with an offset of 4MB or more using fdisk.

sudo fdisk /dev/(your sd device)

write awboot-boot.bin to sdcard with an offset of:

• MBR: 8KB (sector 16)
• GPT: 128KB (sector 256)

sudo dd if=awboot-boot-sd.bin of=/dev/(your sd device) bs=1024 seek=8

• compile (if needed) and copy your .dtb file to the FAT partition.
• copy zImage to the FAT partition.

WIP kernel from here: https://github.com/smaeul/linux/tree/d1/all