10.02.2024 22:09, Kevin O'Connor :
On Wed, Feb 07, 2024 at 03:21:15AM +0300, Michael Tokarev wrote:
07.02.2024 02:17, Michael Tokarev пишет:
[...]
The binary in question is vgabios-stdvga.bin.
[...]
"SMBIOS 2.1 table length 66822 exceeds 65535"Which wont help with 7.2 machine types (it changes defaults for 8.1+).
And yes, running current qemu with -M pc-q35-7.2 shows the same issue again.
So it might not be a gcc issue really, but just a too large bios and gcc-13 is able to produce more compact code which actually fits.
Ah, that makes sense. In the future, if you enable the seabios logs it should help track these things down. (Take the log from the working version and compare it to the log from the non-working version.) I suspect in the log would be messages from seabios/seavgabios hinting to the issue.
Ok, that's a good idea indeed. Somehow I forgot about this.
So, I rebuilt seabios with DEBUG=8. I did NOT rebuilt vgabios though, since after rebuilding it with debug added, the whole thing seem to work. However, the "bad" vgabios is just a bit larger than the "good" one:
-rw-r--r-- 1 mjt mjt 39936 Jan 24 09:35 bios-bad/vgabios-stdvga.bin -rw-r--r-- 1 mjt mjt 39424 Nov 30 20:20 bios-good/vgabios-stdvga.bin
this is from debian seabios package 1.16.3-2 (good, compiled with gcc-13) and 1.16.3-2~bpo12+1 (bad, compiled with gcc-12). There's no difference in there besides the version string and gcc used to compile it, all the rest is exactly the same.
This is debug level 1 difference (qemu machine pc-q35-7.2) -- bpo12+1 is the bad one:
diff -U1 debugcon-good debugcon-bad --- debugcon-good 2024-02-10 22:36:01.432450772 +0300 +++ debugcon-bad 2024-02-10 22:36:23.477127564 +0300 @@ -1,3 +1,3 @@ -SeaBIOS (version 1.16.3-debian-1.16.3-2) -BUILD: gcc: (Debian 13.2.0-7) 13.2.0 binutils: (GNU Binutils for Debian) 2.41 +SeaBIOS (version 1.16.3-debian-1.16.3-2~bpo12+1) +BUILD: gcc: (Debian 12.2.0-14) 12.2.0 binutils: (GNU Binutils for Debian) 2.40 No Xen hypervisor found. @@ -14,3 +14,3 @@ qemu/e820: addr 0x0000000100000000 len 0x0000000040000000 [RAM] -Relocating init from 0x000d4020 to 0x7efeb120 (size 85568) +Relocating init from 0x000d3b00 to 0x7efeae00 (size 86368) Moving pm_base to 0x600 @@ -18,3 +18,3 @@ 1: /pci@i0cf8/pci8086,2922@3/drive@0/disk@0 -kvmclock: at 0xe8580 (msr 0x4b564d01) +kvmclock: at 0xe8380 (msr 0x4b564d01) kvmclock: stable tsc, 3792 MHz @@ -62,5 +62,5 @@ Found 2 cpu(s) max supported 2 cpu(s) -Copying PIR from 0x7efffbe0 to 0x000f5560 -Copying MPTABLE from 0x00006cfc/7efe1bf0 to 0x000f5450 -Copying SMBIOS from 0x00006cfc to 0x000f5290 +Copying PIR from 0x7efffbe0 to 0x000f5500 +Copying MPTABLE from 0x00006cfc/7efe18d0 to 0x000f53f0 +Copying SMBIOS from 0x00006cfc to 0x000f5220 table(50434146)=0x7ffe2134 (via rsdt) @@ -69,7 +69,7 @@ Running option rom at c000:0003 -Start SeaVGABIOS (version 1.16.3-debian-1.16.3-2) -VGABUILD: gcc: (Debian 13.2.0-7) 13.2.0 binutils: (GNU Binutils for Debian) 2.41 +Start SeaVGABIOS (version 1.16.3-debian-1.16.3-2~bpo12+1) +VGABUILD: gcc: (Debian 12.2.0-14) 12.2.0 binutils: (GNU Binutils for Debian) 2.40 enter vga_post: a=00000008 b=0000ffff c=00000000 d=0000ffff ds=0000 es=f000 ss=0000 - si=00000000 di=000060c0 bp=00000000 sp=00006d16 cs=f000 ip=d00f f=0000 + si=00000000 di=00006060 bp=00000000 sp=00006d1a cs=f000 ip=d04a f=0000 VBE DISPI: bdf 00:01.0, bar 0 @@ -81,8 +81,8 @@ Removing mode 19e -Attempting to allocate 512 bytes lowmem via pmm call to f000:d0c0 +Attempting to allocate 512 bytes lowmem via pmm call to f000:d0e6 pmm call arg1=0 -VGA stack allocated at e8380 +VGA stack allocated at e8180 Turning on vga text mode console set VGA mode 3 -SeaBIOS (version 1.16.3-debian-1.16.3-2) +SeaBIOS (version 1.16.3-debian-1.16.3-2~bpo12+1) EHCI init on dev 00:1d.7 (regs=0xfebf2020) @@ -111,5 +111,5 @@ Searching bootorder for: HALT -drive 0x000f5200: PCHS=16383/16/63 translation=lba LCHS=1024/255/63 s=67108864 +drive 0x000f5190: PCHS=16383/16/63 translation=lba LCHS=1024/255/63 s=67108864 Running option rom at cb00:0003 -Space available for UMB: cd800-e7800, f4de0-f51e0 +Space available for UMB: cd800-e7800, f4d80-f5170 Returned 16637952 bytes of ZoneHigh @@ -180,4 +180 @@ VBE mode info request: 118 -VBE mode set: 4144 -set VGA mode 144 -VBE current mode=4144
So it looks like it is stuck at setting VBE mode.
Attached are 2 level-8 debug logs from good and bad runs. Unfortunately I see about the same picture as above, with lots of details before last 3 lines, and the same 3 last lines difference. Trying to find a working combination for vgabios debugging..
Does it make any sense so far?
Thanks,
/mjt