[yocto] SRCREV spec not working for kernel git recipes

[Elvis Dowson]

Hi,
      I find that specifying a SRCREV doesn't work for kernel git recipes. The following recipe has SRCREV set to the commit id for xilinx_v2.6.37, but during the build process, it is always taking the latest commit id from the master branch, which is at 3.3.0. 

I checked the tmp/work/virtex5-poky-linux/linux-xilinx-2.6.37+git1+ed63a4d76efadcb68f5776e4244766ffea226cc4-r17/git/Makefile

and it clearly is building linux kernel 3.3.0 instead of 2.6.37

contents of Makefile:

VERSION = 3
PATCHLEVEL = 3
SUBLEVEL = 0
EXTRAVERSION = -14.2-build1
NAME = Saber-toothed Squirrel

recipe linux-xilinx_git.bb

inherit kernel xilinx-kernel xilinx-utils
require recipes-kernel/linux/linux-dtb.inc

DESCRIPTION = "Linux kernel for Xilinx platforms"
COMPATIBLE_MACHINE = "(virtex4|virtex5|virtex5mb|spartan6-sp605|spartan6-lx9mb)"

LICENSE = "GPLv2"
LIC_FILES_CHKSUM = "file://COPYING;md5=d7810fab7487fb0aad327b76f1be7cd7"

KBRANCH = "master"

SRCREV = "a5556fb251253ccb674bd22d9703c37f6f8807a8"

SRC_URI = "git://git.xilinx.com/linux-xlnx.git;protocol=git;branch=${KBRANCH} \
           file://defconfig"

LINUX_VERSION ?= "2.6.37"

PR = "r17"
PV = "${LINUX_VERSION}+git${SRCPV}"

XILINX_BOARD ?= "${@find_board(bb.data.getVar('XILINX_BSP_PATH', d, 1), d)}"
KERNEL_DEVICETREE = "${@device_tree(bb.data.getVar('TARGET_ARCH', d, 1), d)}"
KERNEL_DEVICETREE_microblazeel = "${@device_tree(bb.data.getVar('TARGET_CPU', d, 1), d)}"

S = "${WORKDIR}/git"

Elvis Dowson
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