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    SubjectRe: 2.6.11-rc4-mm1 (VFS: Cannot open root device "301")
    Matt Mackall wrote:
    > 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;
    >

    Andrew's above patch fixes the hdb->hdq insanity, but I still need
    CONFIG_BASE_FULL=y. I tried unsetting CONFIG_BASE_FULL, and again
    got the "VFS: Cannot open root device" message (with akpm's patch).

    Steven

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