[OpenBIOS] Loading a PCI Option rom.
Mark Cave-Ayland
mark.cave-ayland at ilande.co.uk
Sun Dec 17 17:12:13 CET 2017
On 17/12/17 16:00, Jd Lyons wrote:
> Ok, here's what I'm getting now:
>
> C>> annot manage 'VGA controller' PCI device type 'display':
> >> 10de 141 (3 0 0)
>
> >> =============================================================
> >> OpenBIOS 1.1 [Dec 17 2017 13:36]
> >> Configuration device id QEMU version 1 machine id 2
> >> CPUs: 1
> >> Memory: 128M
> >> UUID: 00000000-0000-0000-0000-000000000000
> >> CPU type PowerPC,750
> milliseconds isn't unique.
> Welcome to OpenBIOS v1.1 built on Dec 17 2017 13:36
>
> 0 > load hd:,\ppc\6600.fcode ok
> 0 > 4000000 400 dump
> 4000000 55 aa 40 00 00 00 00 00 00 00 00 00 00 00 00 00
> U�@.............
> 4000010 00 00 00 00 00 00 00 00 20 00 00 00 00 00 00 00 ........
> .......
> 4000020 50 43 49 52 de 10 41 01 00 00 20 00 00 00 00 03 PCIR�.A...
> .....
> 4000030 84 00 00 00 01 80 00 00 00 00 00 00 00 00 00 00
> �....�..........
> 4000040 f1 08 17 0f 00 01 06 55 12 2a 00 00 00 00 00 00
> �......U.*......
> 4000050 00 00 00 00 de 10 50 00 3e 00 21 00 81 90 40 a3
> ....�.P.>.!.��@�
> 4000060 00 00 00 00 90 04 00 80 00 00 a5 f4 00 00 00 00
> ....�..�..��....
> 4000070 00 00 00 00 52 a5 b5 08 00 ba a5 10 00 00 00 08
> ....R��..��.....
> 4000080 b5 08 01 be a7 b5 08 02 be a7 b5 08 03 be 10 00
> �..���..���..�..
> 4000090 00 00 04 b5 08 04 be a7 b5 08 05 be a6 b5 08 06
> ...�..���..���..
> 40000a0 be a6 b5 08 07 be a6 b5 08 08 be a6 b5 08 09 be
> ���..���..���..�
> 40000b0 a6 b5 08 0a be a6 b5 08 0b be a6 b5 08 0c be 10
> ��..���..���..�.
> 40000c0 00 00 00 0a b5 08 0d be a5 b5 08 0e be a6 b5 08
> ....�..���..���.
> 40000d0 0f be a6 b5 08 10 be a6 b5 08 11 be 10 00 00 00
> .���..���..�....
> 40000e0 10 b5 08 12 be 10 00 00 00 48 b5 08 13 be a6 b5
> .�..�....H�..���
> 40000f0 08 14 be a6 b5 08 15 be b5 08 16 ba a5 a7 b5 08
> ..���..��..����.
> 4000100 17 be a6 b5 08 18 be a6 b5 08 19 be a6 b5 08 1a
> .���..���..���..
> 4000110 be a6 b5 08 1b be a6 b5 08 1c be a6 b5 08 1d be
> ���..���..���..�
> 4000120 a6 b5 08 1e be a6 b5 08 1f be a6 b5 08 20 be a6
> ��..���..���. ��
> 4000130 b5 08 21 be a6 b5 08 22 be a6 b5 08 23 be a6 b5
> �.!���."���.#���
> 4000140 08 24 be a6 b5 08 25 be a6 b5 08 26 be a6 b5 08
> .$���.%���.&���.
> 4000150 27 be b5 08 28 ba a5 a6 b5 08 29 be a6 b5 08 2a
> '��.(����.)���.*
> 4000160 be a5 b5 08 2b be a6 b5 08 2c be 10 00 00 00 04
> ���.+���.,�.....
> 4000170 b5 08 2d be a6 b5 08 2e be a6 b5 08 2f be a6 b5
> �.-���..���./���
> 4000180 08 30 be a7 b5 08 31 be a7 b5 08 32 be 10 00 00
> .0���.1���.2�...
> 4000190 00 06 b5 08 33 be 10 00 00 00 23 b5 08 34 be 10
> ..�.3�....#�.4�.
> 40001a0 00 00 00 11 b5 08 35 be 10 00 00 00 09 b5 08 36
> ....�.5�.....�.6
> 40001b0 be 10 00 00 00 2e b5 08 37 be a6 b5 08 38 be b5
> �.....�.7���.8��
> 40001c0 08 39 ba a5 a6 b5 08 3a be a6 b5 08 3b be a6 b5
> .9����.:���.;���
> 40001d0 08 3c be a6 b5 08 3d be a7 b5 08 3e be a7 b5 08
> .<���.=���.>���.
> 40001e0 3f be a7 b5 08 40 be a7 b5 08 41 be a7 b5 08 42
> ?���.@���.A���.B
> 40001f0 be a7 b5 08 43 be a7 b5 08 44 be a7 b5 08 45 be
> ���.C���.D���.E�
> 4000200 a7 b5 08 46 be a7 b5 08 47 be a7 b5 08 48 be a7
> ��.F���.G���.H��
> 4000210 b5 08 49 be 10 00 00 00 04 b5 08 4a be a6 b5 08
> �.I�.....�.J���.
> 4000220 4b be a6 b5 08 4c be a6 b5 08 4d be a6 b5 08 4e
> K���.L���.M���.N
> 4000230 be a6 b5 08 4f be a6 b5 08 50 be a6 b5 08 51 be
> ���.O���.P���.Q�
> 4000240 a6 b5 08 52 be 10 00 00 00 04 b5 08 53 be 10 00
> ��.R�.....�.S�..
> 4000250 00 00 18 b5 08 54 be a6 b5 08 55 be a6 b5 08 56
> ...�.T���.U���.V
> 4000260 be a6 b5 08 57 be a6 b5 08 58 be a6 b5 08 59 be
> ���.W���.X���.Y�
> 4000270 a6 b5 08 5a be a6 b5 08 5b be a6 b5 08 5c be 10
> ��.Z���.[���.\�.
> 4000280 00 00 00 04 b5 08 5d be a6 b5 08 5e be a6 b5 08
> ....�.]���.^���.
> 4000290 5f be a6 b5 08 60 be a6 b5 08 61 be a6 b5 08 62
> _���.`���.a���.b
> 40002a0 be a6 b5 08 63 be a6 b5 08 64 be a6 b5 08 65 be
> ���.c���.d���.e�
> 40002b0 a7 b5 08 66 be a7 b5 08 67 be b5 08 68 ba a5 a6
> ��.f���.g��.h���
> 40002c0 b5 08 69 be a6 b5 08 6a be a6 b5 08 6b be a6 b5
> �.i���.j���.k���
> 40002d0 08 6c be a7 b5 08 6d be a7 b5 08 6e be a7 b5 08
> .l���.m���.n���.
> 40002e0 6f be a7 b5 08 70 be a7 b5 08 71 be a6 b5 08 72
> o���.p���.q���.r
> 40002f0 be a6 b5 08 73 be a6 b5 08 74 be a6 b5 08 75 be
> ���.s���.t���.u�
> 4000300 a6 b5 08 76 be b5 08 77 ba a5 a6 b5 08 78 be a6
> ��.v��.w����.x��
> 4000310 b5 08 79 be a6 b5 08 7a be a6 b5 08 7b be 10 00
> �.y���.z���.{�..
> 4000320 00 00 04 b5 08 7c be 10 00 00 00 04 b5 08 7d be
> ...�.|�.....�.}�
> 4000330 10 00 00 00 04 b5 08 7e be 10 00 00 00 04 b5 08
> .....�.~�.....�.
> 4000340 7f be 10 00 00 00 04 b5 08 80 be 10 00 00 00 04 �.....�.��.....
> 4000350 b5 08 81 be b5 08 82 ba a5 10 00 00 00 04 b5 08
> �.���.���.....�.
> 4000360 83 be 10 00 00 00 04 b5 08 84 be 10 00 00 00 04
> ��.....�.��.....
> 4000370 b5 08 85 be 10 00 00 00 04 b5 08 86 be 10 00 00
> �.��.....�.��...
> 4000380 00 04 b5 08 87 be 10 00 00 00 04 b5 08 88 be 10
> ..�.��.....�.��.
> 4000390 00 00 00 04 b5 08 89 be 10 00 00 00 04 b5 08 8a
> ....�.��.....�.�
> 40003a0 be 10 00 00 00 04 b5 08 8b be 10 00 00 00 04 b5
> �.....�.��.....�
> 40003b0 08 8c be 10 00 00 00 04 b5 08 8d be 10 00 00 00
> .��.....�.��....
> 40003c0 04 b5 08 8e be b5 08 8f ba a5 a6 b5 08 90 be a6
> .�.���.�����.���
> 40003d0 b5 08 91 be a6 b5 08 92 be a6 b5 08 93 be b5 08
> �.����.����.���.
> 40003e0 94 ba a5 a6 b5 08 95 be a6 b5 08 96 be a7 b5 08
> �����.����.����.
> 40003f0 97 be 10 00 00 00 04 b5 08 98 be 10 00 00 00 04
> ��.....�.��.....
> ok
> 0 > 0 0 " 4,0" " /pci at 80000000" begin-package ok
> 0 > dev /pci ls
> fff8043c QEMU,VGA at 1
> fff84a84 NE2000 at 2
> fff84e5c mac-io at 3
> fff878ac pci10de,141 at 4
> fff884f4 <noname>
> ok
> 0 > setenv focde-debug? true ok
> 0 > 4000020 1 byte-load ok
> 0 > dev /pci ls
> fff8043c QEMU,VGA at 1
> fff84a84 NE2000 at 2
> fff84e5c mac-io at 3
> fff878ac pci10de,141 at 4
> fff884f4 <noname>
> ok
> 0 > printenv
> name "options"
> boot-args ""
> boot-device "hd:,\\:tbxi hd:,\ppc\bootinfo.txt hd:,%BOOT"
> use-generic? "false"
> boot-script ""
> boot-screen ""
> vga-ndrv? "true"
> virt-size "-1"
> virt-base "-1"
> load-base "4000000"
> real-size "-1"
> real-base "-1"
> real-mode? "false"
> little-endian? "false"
> scroll-lock "true"
> skip-netboot? "false"
> default-mac-address "false"
> pci-probe-mask "-1"
> selftest-#megs "0"
> screen-#rows "75"
> screen-#columns "100"
> output-device "/pci at 80000000/mac-io at 3/escc/ch-a"
> input-device "/pci at 80000000/mac-io at 3/escc/ch-a"
> use-nvramrc? "false"
> oem-logo? "false"
> oem-banner ""
> oem-banner? "false"
> nvramrc ""
> fcode-debug? "false"
> diag-switch? "false"
> boot-file ""
> boot-command "boot"
> auto-boot? "false"
> focde-debug? "true"
> ok
> 0 > setenv fcode-debug? true ok
> 0 > 4000020 1 byte-load
> byte-load: warning stack overflow, diff -3
> ok
> 0 >
>
> I'm not sure, I'm assuming something in the Rom is casing a stack overflow?
Looks good. I'm fairly sure from the ROM dump above that the FCode start
byte is 0xf1 which is located at offset 0x40, so try changing the
byte-load line to:
true to ?fcode-verbose
4000040 1 byte-load
> Does openbios support fcode-verbose?
Yes - I've added it into the snippet above for reference.
> gdb '/home/jam/os9.2/obj-ppc/openbios-qemu.elf.nostrip'
> GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
> Copyright (C) 2016 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later
> <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law. Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "x86_64-linux-gnu".
> Type "show configuration" for configuration details.
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> Find the GDB manual and other documentation resources online at:
> <http://www.gnu.org/software/gdb/documentation/>.
> For help, type "help".
> Type "apropos word" to search for commands related to "word"...
> Reading symbols from
> /home/jam/os9.2/obj-ppc/openbios-qemu.elf.nostrip...done.
> (gdb) target remote :1234
> Remote debugging using :1234
> warning: while parsing target description (at line 1): Target
> description specified unknown architecture "powerpc:common"
> warning: Could not load XML target description; ignoring
> 0x00000000 in ?? ()
> (gdb) b load
> Breakpoint 1 at 0xfff16f7c: file
> /Users/jam/OpenBios/master/libopenbios/load.c, line 55.
> (gdb) c
> Continuing.
>
> gdb isn't breaking at the load command, but I'm not sure that matters
> anymore, as it's working, anyway.
If you want to build OpenBIOS yourself and use QEMU's gdbstub on an x86
host then you'll need to build yourself a powerpc cross-compiler and
cross-gdb - a search using Google will give you lots of different
tutorials as to how to do this.
ATB,
Mark.
More information about the OpenBIOS
mailing list