linux-kernel - [PATCH] x86/Kconfig: Transmeta Crusoe is cpu family 5, not 6

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Date: Sun, 7 Jan 2024 14:16:57 +0100
From: Aleksander Mazur <deweloper@...pl>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Cc: Aleksander Mazur <deweloper@...pl>, "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH] x86/Kconfig: Transmeta Crusoe is cpu family 5, not 6

I found out I am no longer able to boot kernel compiled with CONFIG_MCRUSOE=y on
my HP t5300 with CPU: Transmeta(tm) Crusoe(tm) Processor TM5500 (family: 0x5,
model: 0x4, stepping: 0x3). It says:

> This kernel requires an i686 CPU, but only detected an i586 CPU.
> Unable to boot - please use a kernel appropriate for your CPU.    

It looks like this is caused by 25d76ac888216c369dea91768764728b83769799 which
started setting X86_MINIMUM_CPU_FAMILY=6 for MCRUSOE while CPUID gives family=5.

I was able to fix the problem with a patch included below. It just changes
X86_MINIMUM_CPU_FAMILY to 5. No other change was necessary (using -march=i686
seems fine).

/proc/cpuinfo:
processor	: 0
vendor_id	: GenuineTMx86
cpu family	: 5
model		: 4
model name	: Transmeta(tm) Crusoe(tm) Processor TM5500
stepping	: 3
cpu MHz		: 532.091
cache size	: 256 KB
fdiv_bug	: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 1
wp		: yes
flags		: fpu vme de pse tsc msr cx8 sep cmov mmx longrun lrti constant_tsc cpuid
bugs		: cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf mds swapgs itlb_multihit mmio_unknown
bogomips	: 1064.18
clflush size	: 32
cache_alignment	: 32
address sizes	: 32 bits physical, 32 bits virtual
power management:

--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -375,7 +375,7 @@
 config X86_MINIMUM_CPU_FAMILY
 	int
 	default "64" if X86_64
-	default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MCRUSOE || MCORE2 || MK7 || MK8)
+	default "6" if X86_32 && (MPENTIUM4 || MPENTIUMM || MPENTIUMIII || MPENTIUMII || M686 || MVIAC3_2 || MVIAC7 || MEFFICEON || MATOM || MCORE2 || MK7 || MK8)
 	default "5" if X86_32 && X86_CMPXCHG64
 	default "4"