Re: status of grub netboot in GRUB2

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 09/05/2010 03:46 AM, John Lumby wrote:
> Ian Turner wrote:
>
>   
>> What happens when you load GRUB from media and then load the pxe module?
>>     
> Well,  I don't yet know,  as I've not been able to build a bootable floppy 
> image.
> This is 1.98,  installed with --prefix=/usr/grub2 to avoid 
> clashing with my production grub1 and I try this
>
>  /usr/grub2/sbin/grub-install --root-directory=/mnt/dkt fd0
>
> where I created a device map:
>
> cat /mnt/dkt/boot/device.map
> (fd0)     /dev/sdc
>
> but the grub_install fails and a bash -x of it reveals,  near the end,
>
> /usr/grub2/sbin/grub-setup --directory=/mnt/dkt/boot/grub 
> --device-map=/mnt/dkt/boot/grub/device.map fd0
> Invalid device `fd0'.
>   
Well your problem is obvious:

/mnt/dkt/boot/device.map != /mnt/dkt/boot/grub/device.map

And also it's not recommended to specify GRUB device on command line. Just 
remove all device.map and do:

 /usr/grub2/sbin/grub-install --root-directory=/mnt/dkt /dev/sdc

> I copied my grub_install command exactly (other than the explicit path of the 
> script) from the one shown in
>
> http://www.gnu.org/software/grub/manual/html_node/Installing-GRUB-using-grub_002dinstall.html#Installing-GRUB-using-grub_002dinstall
>
> In particular the device name of fd0.
>
> Also the bash -x trace shows that elsewhere in the grub_install script, it 
> did use my devicemap and did map fd0 to /dev/sdc (and in fact built a lot of 
> files on the diskette).  But not bootable!
>
> Can anyone help me build the bootable floppy?    Or does it have to be a CD?  
>  Or is there some other way I can try out your suggestion?
>
>   
>> Do you get access to the PXE filesystem?
>> I think you can even specify the tftp server to use by ...
>>     
>  John
>
>                                         
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>   


-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

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