[Qemu-devel] Custom floppy image not booting, hanging at ramdisk...

[Qemu-devel] Custom floppy image not booting, hanging at ramdisk...

[Damien Mascord]

Heya guys,

I am trying to create my own uclibc/busybox floppy bootdisk, and am running into an issue with the expansion of the RAMDISK... the
CPU shoots up to 100% and even leaving it overnight, it never recovers from that situation.

I have tried it under qemu 0.7.2 and 0.8.0 in linux and windows, and all fail to boot the image, where as vmware (and/or native)
boot the disk fine, and goes correctly to the "Please press Enter to activate this console".

I am using the command line:

qemu -fda floppy.img -boot a

And it loads up the kernel, no problem, reaching the ramdisk stage, and then it dies at the following:

RAMDISK: Compressed image found at block 680

If anyone wants a crack at this, the image can be found at http://tusker.sg/floppy.img

How would I go about debugging this issue?

Cheers in advance,

Damien

Re: [Qemu-devel] Custom floppy image not booting, hanging at ramdisk...

[Damien Mascord]

Hi again,

Sorry to top post, just wanted to know if anyone has had similar experiences to this?

If not, can someone help me debug the issue (bug?) with qemu here?

Damien Mascord wrote:
> Heya guys,
> 
> I am trying to create my own uclibc/busybox floppy bootdisk, and am running into an issue with the expansion of the RAMDISK... the
> CPU shoots up to 100% and even leaving it overnight, it never recovers from that situation.
> 
> I have tried it under qemu 0.7.2 and 0.8.0 in linux and windows, and all fail to boot the image, where as vmware (and/or native)
> boot the disk fine, and goes correctly to the "Please press Enter to activate this console".
> 
> I am using the command line:
> 
> qemu -fda floppy.img -boot a
> 
> And it loads up the kernel, no problem, reaching the ramdisk stage, and then it dies at the following:
> 
> RAMDISK: Compressed image found at block 680
> 
> If anyone wants a crack at this, the image can be found at http://tusker.sg/floppy.img
> 
> How would I go about debugging this issue?
> 
> Cheers in advance,
> 
> Damien
> 
> 
> 
> 
> 
> 
> 
> 
> 
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel

[Qemu-devel] Re: Custom floppy image not booting, hanging at ramdisk...

[Jani Monoses]

Damien Mascord wrote:
> Hi again,
> 
> Sorry to top post, just wanted to know if anyone has had similar experiences to this?
> 
> If not, can someone help me debug the issue (bug?) with qemu here?

This old patch still applies and fixes it.

http://lists.nongnu.org/archive/html/qemu-devel/2004-08/msg00132.html

Jani

Re: [Qemu-devel] Custom floppy image not booting, hanging at ramdisk...

[Christian MICHON]

just send your kernel .config for cross verification
:)

On 4/25/06, Damien Mascord <tusker@tusker.org> wrote:
> Hi again,
>
> Sorry to top post, just wanted to know if anyone has had similar experiences to this?
>
> If not, can someone help me debug the issue (bug?) with qemu here?
>

Re: [Qemu-devel] Custom floppy image not booting, hanging at ramdisk...

[Damien Mascord]

Christian MICHON wrote:
> just send your kernel .config for cross verification
> :)

Heya Christian,

I use the same kernel to boot from a hard-disk, and also from a CD-ROM, and both work correctly.

The following patch (against latest CVS) enables the floppy to boot correctly.  This patch was suggested by Jani Monoses
(http://lists.nongnu.org/archive/html/qemu-devel/2004-08/msg00132.html).

Given that it works with this patch, I can't see how it could be a kernel config issue, no offence intended :)

Damien

Index: block.c
===================================================================
RCS file: /cvsroot/qemu/qemu/block.c,v
retrieving revision 1.26
diff -u -r1.26 block.c
--- block.c     25 Apr 2006 22:36:06 -0000      1.26
+++ block.c     26 Apr 2006 01:52:26 -0000
@@ -729,7 +729,7 @@

     lseek(s->fd, sector_num * 512, SEEK_SET);
     ret = read(s->fd, buf, nb_sectors * 512);
-    if (ret != nb_sectors * 512)
+    if (ret == -1)
         return -1;
     return 0;
 }


> On 4/25/06, Damien Mascord <tusker@tusker.org> wrote:
>> Hi again,
>>
>> Sorry to top post, just wanted to know if anyone has had similar experiences to this?
>>
>> If not, can someone help me debug the issue (bug?) with qemu here?
>>
> 
> 
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel

Re: [Qemu-devel] Custom floppy image not booting, hanging at ramdisk...

[Christian MICHON]

none taken :)
it's just that myself last year I created small kernels which sometimes would
freeze too at the expansion step, but then it was a kernel config issue.

I'll look at the patch though :)

On 4/26/06, Damien Mascord <tusker@tusker.org> wrote:
> Given that it works with this patch, I can't see how it could be a kernel config
> issue, no offence intended :)