Re: Can't Mount CF-Card on boot of 2.6.15 Kernel on EPIA - VFS: Cannot open root device

[Markus Biermaier]

Am 12.06.2006 um 21:09 schrieb Jan Engelhardt:


> Hm. Maybe http://lkml.org/lkml/2005/2/26/92 (updated version for
> 2.6.16/.17 below) can help you.
>
> diff --fast -Ndpru linux-2.6.17-rc6~/block/genhd.c linux-2.6.17-rc6 
> +/block/genhd.c
> --- linux-2.6.17-rc6~/block/genhd.c	2006-06-06 02:57:02.000000000  
> +0200
> +++ linux-2.6.17-rc6+/block/genhd.c	2006-06-08 22:29:16.607058000  
> +0200
> @@ -214,6 +214,52 @@ struct gendisk *get_gendisk(dev_t dev, i
>  	return  kobj ? to_disk(kobj) : NULL;
>  }
>
> +/*
> + * printk a full list of all partitions - intended for
> + * places where the root filesystem can't be mounted and thus
> + * to give the victim some idea of what went wrong
> + */
> +void printk_all_partitions(void)


Am 13.06.2006 um 09:47 schrieb Markus Biermaier:


> to get the function "printk_all_partitions" compiled I simply  
> commented out "mutex_lock" and "mutex_unlock"...
>
> So the result before the boot-panic is:
>
> ...
> here are the partitions available:
> 2100     500472 hde driver: ide-disk
>   2101     500440 hde1
> ...
> What does this mean?

This holds the solution:
                        /* Note, unlike /proc/partitions I'm showing  
the numbers in hex
                           in the same format as the root= option */
                        printk("%02x%02x %10llu %s",
                               sgp->major, sgp->first_minor,
                               (unsigned long long)get_capacity(sgp)  
>> 1,
                               disk_name(sgp, 0, buf));

So my "/tftpboot/pxelinux.cfg/Cxxxxxx" is:
------------------------- [ BEGIN Cxxxxxx ] -------------------------
DEFAULT standard
LABEL standard
KERNEL vmlinuz
# APPEND initrd=initrd ramdisk_size=32768 root=/dev/hde1 udev  
acpi=off rootdelay=5
APPEND initrd=initrd ramdisk_size=32768 root=2101 udev acpi=off  
rootdelay=5
------------------------- [ END   Cxxxxxx ] -------------------------

so the right root-string is: "root=2101".

But can anyone tell me how "root=/dev/hde1" translates to "root=2101"???

Thank you very much, Jan.

You brought me the solution.

Thanks
Markus

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