* Martin Michlmayr <t...@cyrius.com> [2010-06-07 18:10]:
> I'm not claiming that you'll actually be able to boot from ubifs with
> that ramdisk though. For that, i-t needs to be taught to know what to
> do about something like root=ubi0:rootfs.
Ok, here's a patch with which you can boot from ubi with i-t when ubi is
modular.
It essentially does three things:
- adds the correct modules to the ramdisk (for MODULES=dep and MODULES=most)
- reads ubi.mtd= from the command line
- loads ubi with the ubi.mtd info and ignores the "Waiting for root" check
I've successfully tested this with a kernel with modular ubi and with
the following boot variants:
console=ttyS0,115200 ubi.mtd=2 root=ubi0:rootfs rootfstype=ubifs
console=ttyS0,115200 ubi.mtd=2 root=ubi0_0 rootfstype=ubifs
With
console=ttyS0,115200 ubi.mtd=2 root=/dev/ubi0_0 rootfstype=ubifs
I get an error that it cannot mount root but I suspect this is an
ubifs error and has nothing to do with i-t (since at this point I can
manually mount it with -t ubifs ubi0_0 whereas the /dev/ variant
doesn't work).
Tested with MODULES=dep and MODULES=most as well as with a kernel that
has ubifs built in.
Signed-off-by: Martin Michlmayr <t...@cyrius.com>
diff --git a/hook-functions b/hook-functions
index 6a6e233..895eca0 100644
--- a/hook-functions
+++ b/hook-functions
@@ -231,6 +231,10 @@ dep_add_modules()
# most of the commands below only work with block devices.
if [ "${FSTYPE}" = "ubifs" ]; then
manual_add_modules "${FSTYPE}"
+ # add some modules required by ubifs on which it doesn's depend
+ manual_add_modules deflate
+ manual_add_modules zlib
+ manual_add_modules lzo
return
fi
@@ -424,6 +428,11 @@ auto_add_modules()
block)
copy_modules_dir kernel/drivers/block
;;
+ ubi)
+ for x in deflate zlib lzo ubi ubifs; do
+ manual_add_modules "${x}"
+ done
+ ;;
ieee1394)
for x in ohci1394 sbp2; do
manual_add_modules "${x}"
@@ -456,6 +465,7 @@ auto_add_modules()
auto_add_modules ata
auto_add_modules i2o
auto_add_modules dasd
+ auto_add_modules ubi
auto_add_modules ieee1394
auto_add_modules firewire
auto_add_modules mmc
diff --git a/init b/init
index 142eb14..798717c 100755
--- a/init
+++ b/init
@@ -42,6 +42,7 @@ export ROOTFSTYPE=
export IP=
export BOOT=
export BOOTIF=
+export UBIMTD=
export break=
export init=/sbin/init
export quiet=n
@@ -126,6 +127,9 @@ for x in $(cat /proc/cmdline); do
boot=*)
BOOT=${x#boot=}
;;
+ ubi.mtd=*)
+ UBIMTD=${x#ubi.mtd=}
+ ;;
resume=*)
RESUME="${x#resume=}"
;;
@@ -257,6 +261,7 @@ unset ROOT
unset IP
unset BOOT
unset BOOTIF
+unset UBIMTD
unset blacklist
unset break
unset noresume
diff --git a/scripts/local b/scripts/local
index cca5e8d..46ab0f3 100644
--- a/scripts/local
+++ b/scripts/local
@@ -8,6 +8,13 @@ pre_mountroot()
wait_for_udev 10
+ # Load ubi with the correct MTD partition and return since fstype
+ # doesn't work with a char device like ubi.
+ if [ -n "$UBIMTD" ]; then
+ modprobe ubi mtd=$UBIMTD
+ return
+ fi
+
# Don't wait for a root device that doesn't have a corresponding
# device in /dev (ie, mtd0)
if [ "${ROOT#/dev}" = "${ROOT}" ]; then
--
Martin Michlmayr
http://www.cyrius.com/
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