[SOLVED] Missing Microcode for old Intel CPU

derguteweka · 03-19-2024, 03:16 PM

Moin,

Currently i'm trying to build BLFS-12.1 on a pretty old Dell-Latitude-D810.
This is /proc/cpuinfo:

Code:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 13
model name	: Intel(R) Pentium(R) M processor 1.86GHz
stepping	: 8
microcode	: 0x20
cpu MHz		: 800.000
cache size	: 2048 KB
fdiv_bug	: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx bts cpuid est tm2
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit mmio_unknown
bogomips	: 1596.04
clflush size	: 64
cache_alignment	: 64
address sizes	: 32 bits physical, 32 bits virtual
power management:

So i'd assume, that intel-microcode file should have a name like:
06-0d-08
Unfortunatelly, i don't find such a file in the github link provided by the BLFS-Book in the chapter "About Firmware".
Is there any chance left for me to get the spectres and meltdown issues of that CPU fixed?

cheers,
WK

mrmazda · 03-19-2024, 07:44 PM

"Like"?

Code:

# rpm -ql ucode-intel | grep 06-0[de]
/lib/firmware/intel-ucode/06-06-0d
/lib/firmware/intel-ucode/06-0d-06
/lib/firmware/intel-ucode/06-0e-08
/lib/firmware/intel-ucode/06-0e-0c
# ls -gG /lib/firmware/intel-ucode/06-0[de]*
-rw-r--r-- 1 2048 Nov 16 02:08 /lib/firmware/intel-ucode/06-0d-06
-rw-r--r-- 1 4096 Nov 16 02:08 /lib/firmware/intel-ucode/06-0e-08
-rw-r--r-- 1 8192 Nov 16 02:08 /lib/firmware/intel-ucode/06-0e-0c
#

derguteweka · 03-21-2024, 06:11 PM

Moin,

I doubt any of the microcodes you showed is matching my cpu.
Can't try it now, because the CPU is currently pretty busy compiling rustc and nodejs, which might take its time...

cheers,
WK

derguteweka · 03-29-2024, 01:51 PM

Moin,

meanwhile i found somebody else complaining about missing microcodes:
https://github.com/intel/Intel-Linux...iles/issues/10
so i took an elder intel-microcode package from Debian and extracted it. It had a microcode file named 06-0d-08, like i expected. Size 4096 bytes.
But it looks like i'm not able to load it.

Code:

[    0.245736] CPU: Intel(R) Pentium(R) M processor 1.86GHz (family: 0x6, model: 0xd, stepping: 0x8)
[    0.245814] Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
[    0.245883] Spectre V2 : Mitigation: Retpolines
[    0.245937] Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch
[    0.246002] Spectre V2 : Spectre v2 / SpectreRSB : Filling RSB on VMEXIT
[    0.246060] Speculative Store Bypass: Vulnerable
[    0.246121] MDS: Vulnerable: Clear CPU buffers attempted, no microcode
[    0.246178] MMIO Stale Data: Unknown: No mitigations

I tried early loading via grub/initrd as described in BLFS Book in "Early loading of microcode". Also tried to put it directly into the kernel.
Also tried to do late loading, which is a bit strange, because to make late loading available in kernelconfig, i have to enable SMP. Which is crap, because my Pentium M just has one single core. But anyway, didnt work out also. Got some error like "file not found", when echoing 1 to /sys/devices/yadayada...
Anything left i can try?

cheers,
WK

derguteweka · 04-03-2024, 01:57 PM

Moin,

Just got bad news: the issues never got fixed. CPU is to old, no microcode available...

Cheers,
WK