Intel microcode is not updated on 24.10.1

For Developers
1

Intel microcode on 24.10.1 stopped being reloaded
echo 1 > /sys/devices/system/cpu/microcode/reload
ash: write error: No such file or directory
although it exists
Could be related

aabc61d93f89bf3253bad98fd2fe8d5450c352bf

7cf8f61eb24c32bb47925cbd11f1cde68c9ba0b9

2

Post the output of dmesg|grep microcode

3

The issue is with minrev commit, ive temporarily fixed it by setting microcode.force_minrev=0 in boot parameters (grub.cfg).
Seems like revision version is not handled properly.
The log contained only 2 msgs indicating that microcode driver itself is loaded.

Now it's

root@OpenWrt:~# dmesg|grep microcode
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz root=PARTUUID=e9bad6fa-7d1c-4dd0-c46b-4b84e666df02 rootwait console=tty1 console=ttyS0,115200n8 noinitrd microcode.force_minrev=0
[    0.037533] Kernel command line: BOOT_IMAGE=/boot/vmlinuz root=PARTUUID=e9bad6fa-7d1c-4dd0-c46b-4b84e666df02 rootwait console=tty1 console=ttyS0,115200n8 noinitrd microcode.force_minrev=0
[    0.623562] Register File Data Sampling: Vulnerable: No microcode
[    1.378122] microcode: Current revision: 0x0000000e
[    1.379844] microcode: Microcode Update Driver: v2.2.
[    3.342049] microcode: Late microcode loading without minimal revision check.
[    3.345680] microcode: You should switch to early loading, if possible.
[    3.350533] microcode: load: updated on 1 primary CPUs with 3 siblings
[    3.353404] microcode: revision: 0xe -> 0x1c

Before it was only

[    0.623562] Register File Data Sampling: Vulnerable: No microcode
[    1.378122] microcode: Current revision: 0x0000000e
[    1.379844] microcode: Microcode Update Driver: v2.2.
4

Actually microcode got updated.