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

[Simon Glass]

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.

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

Regards,
Simon