[Question] Where is the source located of `msd/bootcode.bin` & `msd/start*.elf`?

Question

[Question] Where is the source located of `msd/bootcode.bin` & `msd/start*.elf`?

WeeJeWel opened this issue 2 years ago · 4 comments

I'd like to view an example on how to compile my own bootable firmware (specifically to try flashing a CM4 over WebUSB for fun).

Is this source available anywhere?

Answer 1 · 2022-05-30T21:30:50.000Z

The VPU firmware is closed-source. The recommended method for a task such as the one you describe is to create a Buildroot Linux system with an initrd that does the job.

Answer 2 · 2022-06-10T20:24:19.000Z

Take a look at the msd gadget for an example kernel and initrd. The ARM stage loading does not require Linux so you can replace the kernel with bare metal
ARM code

Answer 3 · 2022-06-25T10:45:52.000Z

specifically to try flashing a CM4 over WebUSB for fun

already implemented that!
https://github.com/librerpi/rpi-tools/tree/master/webusbboot

Answer 4 · 2022-06-25T14:40:33.000Z

specifically to try flashing a CM4 over WebUSB for fun

already implemented that! https://github.com/librerpi/rpi-tools/tree/master/webusbboot

Yes, that’s nice, but it mounts as MSD which then isn’t available anymore from a browser.