[U-Boot] [PATCH 12/12] x86: Document how to play with SeaBIOS

[Bin Meng]

Hi Simon,

On Tue, Mar 1, 2016 at 10:03 AM, Simon Glass <sjg at chromium.org> wrote:
> Hi Bin,
>
> On 29 February 2016 at 00:21, Bin Meng <bmeng.cn at gmail.com> wrote:
>> Hi Simon,
>>
>> On Mon, Feb 29, 2016 at 12:19 PM, Simon Glass <sjg at chromium.org> wrote:
>>> On 27 February 2016 at 23:58, Bin Meng <bmeng.cn at gmail.com> wrote:
>>>> Boting SeaBIOS is done via U-Boot's bootelf command. Document this.
>>>>
>>>> Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
>>>>
>>>> ---
>>>>
>>>>  doc/README.x86 | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
>>>>  1 file changed, 47 insertions(+), 2 deletions(-)
>>>
>>> Reviewed-by: Simon Glass <sjg at chromium.org>
>>>
>>> I think it would be good to add instructions on creating disk.img.
>>
>> Sure.
>>
>>>
>>> Also, when I ran this (64-bit ubuntu) I get:
>>>
>>> qemu-system-i386 -serial stdio -bios ~/u/b/qemu-x86/u-boot.rom -hda
>>> disk.img -cdrom /vid/software/win/winxp.iso -smp 2 -m 512
>>> WARNING: Image format was not specified for 'disk.img' and probing guessed raw.
>>>          Automatically detecting the format is dangerous for raw
>>> images, write operations on block 0 will be restricted.
>>>          Specify the 'raw' format explicitly to remove the restrictions.
>>>
>>>
>>> U-Boot 2016.03-rc2-00072-g67c4eef (Feb 28 2016 - 21:13:33 -0700)
>>>
>>> CPU: x86, vendor Intel, device 663h
>>> DRAM:  512 MiB
>>> Using default environment
>>>
>>> Video: 640x480x16
>>> Model: QEMU x86 (I440FX)
>>> Net:   e1000: 52:54:00:12:34:56
>>>
>>> Warning: e1000#0 using MAC address from ROM
>>> eth0: e1000#0
>>> IDE:   Bus 0: OK Bus 1: OK
>>>   Device 0: Model: QEMU HARDDISK  Firm: 2.3.90 Ser#: QM00001
>>>             Type: Hard Disk
>>>             Supports 48-bit addressing
>>>             Capacity: 2048.0 MB = 2.0 GB (4194304 x 512)
>>>   Device 1: not available
>>>   Device 2: Model: QEMU Firm: 2.3. Ser#: QEMU DVD-ROM
>>>             Type: Removable CD ROM
>>>             Capacity: 585.2 MB = 0.5 GB (299648 x 2048)
>>> qemu: fatal: Trying to execute code outside RAM or ROM at 0xf10002ba
>>>
>>> EAX=5bfb0000 EBX=0000f8ec ECX=00000ff3 EDX=00000000
>>> ESI=00000002 EDI=c8000014 EBP=1ffceea5 ESP=00000005
>>> EIP=f10002ba EFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
>>> ES =0000 00000000 00000000 00000000
>>> CS =0010 00000000 ffffffff 00cf9b00 DPL=0 CS32 [-RA]
>>> SS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
>>> DS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
>>> FS =0020 1fd67dc8 ffffffff 00cf9300 DPL=0 DS   [-WA]
>>> GS =0018 00000000 ffffffff 00cf9300 DPL=0 DS   [-WA]
>>> LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
>>> TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
>>> GDT=     1fd67d80 00000047
>>> IDT=     1ffce470 000007ff
>>> CR0=00000033 CR2=00000000 CR3=00000000 CR4=00000000
>>> DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000
>>> DR6=ffff0ff0 DR7=00000400
>>> CCS=5bfb0000 CCD=5bfb0000 CCO=ADDB
>>> EFER=0000000000000000
>>> FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
>>> FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
>>> FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
>>> FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
>>> FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
>>> XMM00=00000000000000000000000000000000 XMM01=00000000000000000000000000000000
>>> XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000
>>> XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000
>>> XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000
>>> Aborted
>>>
>>
>> Which QEMU version is this on your Ubuntu?
>
> I am using:
>
> QEMU emulator version 2.3.90, Copyright (c) 2003-2008 Fabrice Bellard

I am using QEMU 2.3.0, built from source.

> It seems to be the winxp.iso that kills it. Maybe mind is broken? I'm
> pretty sure I have installed from it ages ago though.
>

That's strange. Based on U-Boot log, it seems it just executes to a
place where the U-Boot IDE driver is probing the IDE devices (in this
case, a hard disk and a CD-ROM are identified), but somehow it crashed
without printing the 'Device 3', like my log below.

IDE:   Bus 0: OK Bus 1: OK
  Device 0: Model: QEMU HARDDISK  Firm: 2.3.0  Ser#: QM00001
            Type: Hard Disk
            Supports 48-bit addressing
            Capacity: 10240.0 MB = 10.0 GB (20971520 x 512)
  Device 1: not available
  Device 2: Model: QEMU Firm: 2.3. Ser#: QEMU DVD-ROM
            Type: Removable CD ROM
            Capacity: 694.4 MB = 0.6 GB (355541 x 2048)
  Device 3: not available
Hit any key to stop autoboot:  0

I have no idea, maybe it's something wrong with the iso, or QEMU version (?).

Regards,
Bin