Re: kern/56935: NetBSD HEAD/202207161950Z i386 kernel misidentifies CPU and panics when multiboot-ed

[mlelstv%serpens.de@localhost (Michael van Elst)]

The following reply was made to PR kern/56935; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/56935: NetBSD HEAD/202207161950Z i386 kernel misidentifies CPU and panics when multiboot-ed
Date: Wed, 1 Feb 2023 08:42:43 -0000 (UTC)

 ivan%siamics.net@localhost (Ivan Shmakov) writes:
 
 >>Number:         56935
 >>Category:       kern
 >>Synopsis:       NetBSD HEAD/202207161950Z i386 kernel misidentifies CPU and panics when multiboot-ed
 
 >	Attempting to boot NetBSD kernel as of a recent HEAD
 >	snapshot [1] via Syslinux mboot.c32 module under Qemu 3.1
 >	from Debian 10 (oldstable) results in a panic, apparently
 >	due to the CPU being misidentified as 80386-class:
 
 
 This seems to the same as port-i386/57017.
 
 Please try the patch:
 
  Index: sys/arch/i386/i386/locore.S
  ===================================================================
  RCS file: /cvsroot/src/sys/arch/i386/i386/locore.S,v
  retrieving revision 1.190
  diff -p -u -r1.190 locore.S
  --- sys/arch/i386/i386/locore.S 7 Sep 2022 00:40:18 -0000       1.190
  +++ sys/arch/i386/i386/locore.S 1 Feb 2023 08:10:11 -0000
  @@ -415,7 +415,7 @@ multiboot1_loader:
          pushl   %ebx            /* Address of Multiboot information */
          call    _C_LABEL(multiboot1_pre_reloc)
          addl    $4,%esp
  -       jmp     2f
  +       jmp     .Lstart_common
 
   efi_multiboot2_loader:
          /*