Re: Please validate test kernel on UltraSPARC machines

On 7/18/25 3:04 PM, John Paul Adrian Glaubitz wrote:
> On Thu, 2025-07-17 at 08:53 -0600, Stan Johnson wrote:
>> On a Sparc Ultra-30, booting stops at "Fast Data Access MMU Miss".
> 
> And booting the standard 6.12.38 kernel [1] without the patch works?
> 
> Adrian
> 
>> [1] http://ftp.ports.debian.org/debian-ports/pool-sparc64/main/l/linux/linux-image-6.12.38+deb13-sparc64_6.12.38-1_sparc64.deb
> 

The standard Debian SID 6.12.38 kernel also has the "Fast Data Access 
MMU Miss" on my Ultra-30, so your patch is likely not causing the issue.

The "Fast Data Access MMU Miss" may be related to the size of the initrd 
(it happens right after loading the initrd; the kernel has already been 
loaded). This appears to have been happening since around kernel 6.x:

https://lists.debian.org/debian-sparc/2023/07/msg00070.html

I'm currently using a custom 6.4.8 kernel, and the initrd associated 
with that kernel is only around 6 MB and does not have the issue.

-Stan