On Thu, Jun 19, 2025 at 01:37:53PM -0700, Tony Dinh wrote: > Hi Jerome, > > While fixing some ext4 file system problems on 2025.07-rc4, I ran into > a problem booting a few Kirkwood boards. kwboot loaded the u-boot > image, > and then u-boot execution was frozen without anything going to the > serial console. I did a bisect and found the commit that caused it. > > https://github.com/trini/u-boot/commit/6fe50e39508043f386fc1bd40bbc02b8a75c1940 > > When I tried to reverse this commit, I had a build error like this > "{standard input}:24246: Error: selected processor does not support > `mrc p15,1,r3,c15,c1,0' in Thumb mode" > > Currently, the only way to boot Kirkwood boards is to disable either > CONFIG_LTO or CONFIG_SYS_THUMB_BUILD or both. > > I'm using the pogo_v4 and nsa325 boards as test beds. Please let me > know if I can help with testing to troubleshoot this regression.
I wonder if the right answer is that CONFIG_SYS_THUMB_BUILD should be off? A quick look around and this (and sheevaplug) are ARM926EJ-S which is Thumb-1 not Thumb-2 and it looks like the kernel for example only supports building itself with thumb2 on armv7/v7m. I know that this was working, so we should dig more too, but I'm not sure what the best answer here is. -- Tom
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