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. All the best, Tony
