[Buildroot-users] Support for Raspberry Pi CM5 on CM 5 IO Board

[Henry Hoegelow]

Hi, 

my name is Henry and I am currently working on a series of musical
instruments, all based on a Raspberry Pi Compute Module 5 sitting on a
Compute Module 5 IO board. So far I haven't been able to use Buildroot
or Yocto to create a bootable image for this setup. 

The commands: 

make raspberrypi5_defconfig 
make 

will create an image, but when I try to boot it I get a kernel panic
(see below). I suspect that a special config is needed for the CM5, as
there are specific configs for the CM4 IO board (raspberrypicm4io,
raspberrypicm4io-64), while for the raspi5 there is only the
raspberrypi5 config.

I have tried to find information on the internet and on the buildroot
mailing lists, but it seems that the CM5 + CM5 IO board is not yet
supported by either buildroot or yocto. Or maybe I am just missing
something obvious?

I'd also like to offer my help in adding support for the board - I am
happy to spend some time on it, but I'd definitely need some pointers.
I already tried to add the bcm2712-rpi-cm5-cm5io.dtb (found in
output/build/rpi-firmware-
5476720d52cf579dc1627715262b30ba1242525e/boot) to the image, it has
made no difference.

Thanks a lot,
Henry

Hardware name: Raspberry Pi Compute Module 5 Rev 1.0 (DT)
Call trace:
dump_backtrace+0x9c/0x100
show_stack+0x20/0x38
dump_stack_lvl+0x48/0x60
dump_stack+0x18/0x28
panic+0x324/0x388
nmi_panic+0x94/0xa0
arm64_serror_panic+0x78/0x98
arm64_is_fatal_ras_serror+0x44/0xc0
serror_interrupt+0x64/0x80
el1h_64_error_handler+0x30/0x48
el1h_64_error+0x64/0x68
bcm2712_pull_config_set+0x64/0xe8
bcm2712_pinconf_set+0x94/0xd8
pinconf_apply_setting+0xa0/0x128
pinctrl_commit_state+0xf0/0x228
pinctrl_select_state+0x24/0x40
pinctrl_bind_pins+0x150/0x168
really_probe+0x5c/0x2d0
__driver_probe_device+0xb8/0x140
driver_probe_device+0x44/0x170
__driver_attach+0x98/0xb8
bus_for_each_dev+0xb4/0xf0
bus_add_driver+0xf8/0x208
driver_register+0x64/0x138
__platform_driver_register+0x30/ 48 
brcmuart_init+ 44 / 88 
do_one_initcall + 60 / 2c8 
kernel_init_freeable + 1f8 / 3eO 
kernel_init + 30 / 210 
ret_from_fork + 10 / 20 
SMP: stopping secondary CPUs 
Kernel Offset: Ox100400000 from Oxffffffc080000000 
PHYS_OFFSET: OxO 
CPU features: OxO,00000001,70028143,000072Ob 
Memory Limit: none 

[ end Kernel panic - not syncing: Asynchronous SError Interrupt ]