Dear Kinky,

On 7/30/19 11:18 AM, Kinky Nekoboi wrote:

loading the microcode via Linux Kernel works.

including it via coreboot causes General Protection Faults.

See included bootlog.

We hit the same issue on our board, and reported it to the Linux kernel
developers [1].

Unfortunately, we didn’t have more resources to pursue this further.

1.  What is your configuration? How many processors, how much RAM?

2.  So, loading it from GNU/Linux (initramfs) as Tom asked, seems to
    work. I guess it’s the same with the vendor firmware?

3.  As Tom tested it on a similar custom AMD board (with supposedly
    microcode updates updated in the *vendor firmware*, and it worked
    for him, there might be something wrong with how microcode updates
    are applied in coreboot.

4.  The user *sfs* in #coreboot@irc.freenode.net did not have the
    problems if I remember correctly.

Anyway, somebody with time and motivation would need to debug this. But
it’d be great if you could check a few things and maybe chime in the
LKML discussion.

Kind regards,

Paul

[1]: https://lkml.org/lkml/2019/1/3/540
     "General protection fault in `switch_mm_irqs_off()`"

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