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    SubjectRe: 2.6.11-rc4-mm1 (VFS: Cannot open root device "301")
    On Wed, Feb 23, 2005 at 03:10:38PM -0700, Steven Cole wrote:
    > Andrew Morton wrote:
    > >Steven Cole <elenstev@mesatop.com> wrote:
    >
    > >>I am having trouble getting recent -mm kernels to boot on my test box.
    > >>For 2.6.11-rc3-mm2 and 2.6.11-rc4-mm1 I get the following:
    > >>
    > >>VFS: Cannot open root device "301" or unknown-block(3,1)
    > >>Please append a correct "root=" boot option
    > >>Kernel panic - not syncing: VFS: Unable to mount root fs on
    > >>unknown-block(3,1)
    > >>
    > [snipped]
    > >
    > >Please set CONFIG_BASE_FULL=y. Check that this causes CONFIG_BASE_SMALL=0,
    > >then retest.
    >
    > Yes, that worked. 2.6.11-rc4-mm1 now boots OK, but hdb1 seems to be
    > missing.

    Can you retry CONFIG_BASE_FULL=n with Andrew's patch?

    You may need to boot back into a sane kernel for LILO to operate properly.

    --- 25/drivers/ide/ide-probe.c~ide_init_disk-fix Wed Feb 23 16:24:44 2005
    +++ 25-akpm/drivers/ide/ide-probe.c Wed Feb 23 16:24:55 2005
    @@ -1269,7 +1269,7 @@ EXPORT_SYMBOL_GPL(ide_unregister_region)
    void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
    {
    ide_hwif_t *hwif = drive->hwif;
    - unsigned int unit = drive->select.all & (1 << 4);
    + unsigned int unit = (drive->select.all >> 4) & 1;

    disk->major = hwif->major;
    disk->first_minor = unit << PARTN_BITS;



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