[U-Boot] qemu-mips usage

[U-Boot] qemu-mips usage

[Luigi 'Comio' Mantellini]

Hi ML,

I'm evaluating the qemu-mips to simulate a mips 4kec/24kec board. I'm working 
on the high level booting sequence (linux init scripts), and qemu+uboot should 
be a good choice to emulate a basic system (flash + dram + 4kec cpu).

Furthermore, also following the doc/README.qemu_mips, I'm not able to see the 
u-boot prompt on my qemu because the flash is not recognized. I haven't 
experience with qemu-mips and I don't understand where the flash is placed 
(canonical 0xbfxxxx address?) and how it is managed. Reading the 
configs/qemu_mips.h, It seems that the flash is managed as a common CFI flash 
placed to 0xbfc00000 address... but u-boot shows always "Unknown FLASH on Bank 
1" on startup.

Has anyone tried to use qemu-mips to boot a standard u-boot image (qemu_mips 
target on u-boot)?


Thanks for any suggestion.

luigi

########### Useful Infos ############

This is the qemu banner (on Ubuntu 8.10):

EMU PC emulator version 0.9.1, Copyright (c) 2003-2008 Fabrice Bellard

This is the execution log:

$ cp ../u-boot-vanilla/u-boot.bin mips_bios.bin
$ dd of=flash bs=1k count=4k if=/dev/zero
4096+0 records in
4096+0 records out
4194304 bytes (4,2 MB) copied, 0,046865 s, 89,5 MB/s
$ dd of=flash bs=1k conv=notrunc if=../u-boot-vanilla/u-boot.bin
163+1 records in
163+1 records out
167076 bytes (167 kB) copied, 0,00124954 s, 134 MB/s
$ qemu-system-mips -M mips -pflash flash -monitor null -nographic
qemu: Warning, could not load MIPS bios '/usr/share/qemu/mips_bios.bin'
Terminated

$ qemu-system-mips -L . -M mips -pflash flash -monitor null -nographic


U-Boot 2009.01-00080-g8f86a36 (gen 26 2009 - 09:23:04)

Board: Qemu -M mips CPU: 24Kf proc_id=0x19300
DRAM:  128 MB
## Unknown FLASH on Bank 1 - Size = 0x00000000 = 0 MB
Terminated
$



-- 
Luigi Mantellini
R&D - Software
Industrie Dial Face S.p.A.
Via Canzo, 4
20068 Peschiera Borromeo (MI), Italy
Tel.:  +39 02 5167 2813
Fax:   +39 02 5167 2459
Email: luigi.mantellini at idf-hit.com

[U-Boot] qemu-mips usage

[Nobuhiro Iwamatsu]

Hi,

Luigi 'Comio' Mantellini wrote:
> Hi ML,
> 
> I'm evaluating the qemu-mips to simulate a mips 4kec/24kec board. I'm working 
> on the high level booting sequence (linux init scripts), and qemu+uboot should 
> be a good choice to emulate a basic system (flash + dram + 4kec cpu).
> 
> Furthermore, also following the doc/README.qemu_mips, I'm not able to see the 
> u-boot prompt on my qemu because the flash is not recognized. I haven't 
> experience with qemu-mips and I don't understand where the flash is placed 
> (canonical 0xbfxxxx address?) and how it is managed. Reading the 
> configs/qemu_mips.h, It seems that the flash is managed as a common CFI flash 
> placed to 0xbfc00000 address... but u-boot shows always "Unknown FLASH on Bank 
> 1" on startup.
> 
> Has anyone tried to use qemu-mips to boot a standard u-boot image (qemu_mips 
> target on u-boot)?
> 
Please check this thread.
http://thread.gmane.org/gmane.comp.boot-loaders.u-boot/42669

Best regards,
  Nobuhiro

[U-Boot] qemu-mips usage

[Jean-Christophe PLAGNIOL-VILLARD]

On 10:13 Mon 26 Jan     , Luigi 'Comio' Mantellini wrote:
> Hi ML,
> 
> I'm evaluating the qemu-mips to simulate a mips 4kec/24kec board. I'm working 
> on the high level booting sequence (linux init scripts), and qemu+uboot should 
> be a good choice to emulate a basic system (flash + dram + 4kec cpu).
> 
> Furthermore, also following the doc/README.qemu_mips, I'm not able to see the 
> u-boot prompt on my qemu because the flash is not recognized. I haven't 
> experience with qemu-mips and I don't understand where the flash is placed 
> (canonical 0xbfxxxx address?) and how it is managed. Reading the 
> configs/qemu_mips.h, It seems that the flash is managed as a common CFI flash 
> placed to 0xbfc00000 address... but u-boot shows always "Unknown FLASH on Bank 
> 1" on startup.
> 
> Has anyone tried to use qemu-mips to boot a standard u-boot image (qemu_mips 
> target on u-boot)?
> 
> 
> Thanks for any suggestion.
> 
> luigi
> 
> ########### Useful Infos ############
> 
> This is the qemu banner (on Ubuntu 8.10):
> 
> EMU PC emulator version 0.9.1, Copyright (c) 2003-2008 Fabrice Bellard
Please use the SVN version of qemu for the current u-boot version

I'll update the README.qemu_mips to specify the last u-boot version for the
old qemu

Best Regards,
J.

[U-Boot] qemu-mips usage

[Luigi 'Comio' Mantellini]

Dear All,

thanks for the help.
I used the last svn copy and it works fine:
URL: svn://svn.savannah.nongnu.org/qemu/trunk
Repository Root: svn://svn.savannah.nongnu.org/qemu
Repository UUID: c046a42c-6fe2-441c-8c8c-71466251a162
Revision: 6436

Anyway I created a trivial patch in order to permit to have an arbitrary flash 
size on mips board (I'm need to simulate a board with 32MB instead the usual 
4M). Using the patch, the flash memory placed at the end of 0xbfxxxxxxxx  
memory space:

4MB flash: start bfc00000 -> end bfffffff
8MB flash: start bf800000 -> end bfffffff
16MB flash: start bf000000 -> end bfffffff
32MB flash: start be000000 -> end bfffffff

The firmware must be placed always at address 0xbfc00000. these are the 
relative address on the file:

4MB flash: firmware offset +0
8MB flash: firmware offset +4MB
16MB flash: firmware offset +12MB
32MB flash: firmware offset +28MB

To create the image files, use the following  trivial script:

dd if=/dev/zero of=flash.img bs=$flashsize count=1 conv=sync
dd if=u-boot.bi of=flash.img bs=1 seek=$biosbase conv=notrunc


Thanks again for your support.

luigi


On Monday 26 January 2009 13:53:07 Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 10:13 Mon 26 Jan     , Luigi 'Comio' Mantellini wrote:
> > Hi ML,
> >
> > I'm evaluating the qemu-mips to simulate a mips 4kec/24kec board. I'm
> > working on the high level booting sequence (linux init scripts), and
> > qemu+uboot should be a good choice to emulate a basic system (flash +
> > dram + 4kec cpu).
> >
> > Furthermore, also following the doc/README.qemu_mips, I'm not able to see
> > the u-boot prompt on my qemu because the flash is not recognized. I
> > haven't experience with qemu-mips and I don't understand where the flash
> > is placed (canonical 0xbfxxxx address?) and how it is managed. Reading
> > the configs/qemu_mips.h, It seems that the flash is managed as a common
> > CFI flash placed to 0xbfc00000 address... but u-boot shows always
> > "Unknown FLASH on Bank 1" on startup.
> >
> > Has anyone tried to use qemu-mips to boot a standard u-boot image
> > (qemu_mips target on u-boot)?
> >
> >
> > Thanks for any suggestion.
> >
> > luigi
> >
> > ########### Useful Infos ############
> >
> > This is the qemu banner (on Ubuntu 8.10):
> >
> > EMU PC emulator version 0.9.1, Copyright (c) 2003-2008 Fabrice Bellard
>
> Please use the SVN version of qemu for the current u-boot version
>
> I'll update the README.qemu_mips to specify the last u-boot version for the
> old qemu
>
> Best Regards,
> J.

-- 
Luigi Mantellini
R&D - Software
Industrie Dial Face S.p.A.
Via Canzo, 4
20068 Peschiera Borromeo (MI), Italy
Tel.:  +39 02 5167 2813
Fax:   +39 02 5167 2459
Email: luigi.mantellini at idf-hit.com

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