imx-m4fwloader

Tool for loading firmware to M4 core on i.MX6SX and i.MX7D from Linux user space.

How to use this

• Use the environment provided to you by Yocto:
  • For example:
  • source /opt/poky/1.8/environment-setup-cortexa9hf-vfp-neon-poky-linux-gnueabi
  • $CC m4fwloader.c -o m4fwloader
  • You get m4fwloader binary...
• Then you need to build your M4 application and link it to some address. (e.g 0x00910000, try: https://github.com/EmbeddedRPC/erpc-imx-demos/tree/master/MCU/example_rpmsg)
• Load it using m4fwloader: ./m4fwloader myapp.bin 0x00910000
• Optionally use --verbose parameter to see what is written to each registers
• Warning: Use this tool for debugging only, since it accesses directly the registers from the user space and requires therefore root priviledges!
• You have been warned... :-)
• Optionally, you can trigger an interrupt using message unit (MU) to the M4 core to get RPMsg started - this is normally done by Linux Kernel during startup: ./m4fwloader kick 0
• Whole usage is here:
  • m4fwloader [filename.bin] [0xLOADADDR] [--verbose] # loads new firmware
  • or: m4fwloader stop # holds the auxiliary core in reset
  • or: m4fwloader start # releases the auxiliary core from reset
  • or: m4fwloader kick [n] # triggers interrupt on RPMsg virtqueue n
• by Marek Novak: [email protected]