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boot-directdisk: allow specifying custom MBR disk signature 

This introduces a DISK_SIGNATURE variable that allows controlling the
32-bit MBR disk signature. By default it is set to an automatically
generated disk signature but it may by overridden in the image recipe
by setting DISK_SIGNATURE to a 8 digit hex string.

This DISK_SIGNATURE variable can also be used in the image recipe to
specify the root by UUID using:
SYSLINUX_ROOT = "root=PARTUUID=${DISK_SIGNATURE}-02"

Specifying the root by UUID allows the kernel to locate the root
filesystem even if the device name changes (e.g. /dev/hda2, /dev/hdb2 or
/dev/sdb2 instead of /dev/sda2) due to differences in hardware
configuration.

(From OE-Core rev: 4382a419b4c90312d22aa55ff535b45bcf704716)

Signed-off-by: Jonathan Liu <net147@gmail.com>
Acked-by: Darren hart <dvhart@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Jonathan Liu 2013-07-10 03:19:45 +00:00 committed by Richard Purdie
parent f9625c227f
commit b52d2bb46e
1 changed files with 20 additions and 0 deletions
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20
meta/classes/boot-directdisk.bbclass
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@ -34,6 +34,7 @@ BOOTDD_EXTRA_SPACE ?= "16384"
# Get the build_syslinux_cfg() function from the syslinux class
AUTO_SYSLINUXCFG = "1"
DISK_SIGNATURE ?= "${DISK_SIGNATURE_GENERATED}"
SYSLINUX_ROOT ?= "root=/dev/sda2"
SYSLINUX_TIMEOUT ?= "10"
@ -80,6 +81,9 @@ build_boot_dd() {
parted $IMAGE set 1 boot on
parted $IMAGE print
echo -ne "$(echo ${DISK_SIGNATURE} | fold -w 2 | tac | paste -sd '' | sed 's/\(..\)/\\x&/g')" | \
dd of=$IMAGE bs=1 seek=440 conv=notrunc
OFFSET=`expr $END2 / 512`
dd if=${STAGING_DATADIR}/syslinux/mbr.bin of=$IMAGE conv=notrunc
dd if=$HDDIMG of=$IMAGE conv=notrunc seek=1 bs=512
@ -91,8 +95,24 @@ build_boot_dd() {
}
python do_bootdirectdisk() {
validate_disk_signature(d)
bb.build.exec_func('build_syslinux_cfg', d)
bb.build.exec_func('build_boot_dd', d)
}
def generate_disk_signature():
import uuid
return str(uuid.uuid4())[:8]
def validate_disk_signature(d):
import re
disk_signature = d.getVar("DISK_SIGNATURE", True)
if not re.match(r'^[0-9a-fA-F]{8}$', disk_signature):
bb.fatal("DISK_SIGNATURE '%s' must be an 8 digit hex string" % disk_signature)
DISK_SIGNATURE_GENERATED := "${@generate_disk_signature()}"
addtask bootdirectdisk before do_build