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Add initramfs support

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Permit to build an image with initramfs.
Add information in README to build with initramfs.

Change-Id: Icb812151a22771717805ec0a82feb7993f462b47
Signed-off-by: Sébastien Mennetrier <s.mennetrier@innotis.org>
This commit is contained in:
Sébastien Mennetrier 2014-02-14 01:22:07 +02:00 committed by Andrei Gherzan
parent d6468b7f91
commit 5e62146ae3
2 changed files with 18 additions and 2 deletions
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13
README
View File

@ -37,6 +37,7 @@ Contents:
2.F. Optional - Video camera support with V4L2 drivers
2.G. Images
2.H. Boot to U-Boot
2.I. Image with Initramfs
3. Extra apps
3.A. omxplayer
4. Source code and mirrors
@ -155,6 +156,18 @@ KERNEL_IMAGETYPE = "uImage"
This will make kernel.img be u-boot image which will load uImage.
By default, kernel.img is the actual kernel image (ex. Image).
2.I. Image with Initramfs
=========================
To build an initramfs image :
* Set this 3 kernel variables (in linux-raspberrypi.inc for example)
- kernel_configure_variable BLK_DEV_INITRD y
- kernel_configure_variable INITRAMFS_SOURCE ""
- kernel_configure_variable RD_GZIP y
* Set the yocto variables (in linux-raspberrypi.inc for example)
- INITRAMFS_IMAGE = "<a name for your initramfs image>"
- INITRAMFS_IMAGE_BUNDLE = "1"
* Set the meta-rasberrypi variable (in raspberrypi.conf for example)
- KERNEL_INITRAMFS = "-initramfs"
3. Extra apps
=============

7
classes/sdcard_image-rpi.bbclass
View File

@ -26,6 +26,9 @@ inherit image_types
# Set kernel and boot loader
IMAGE_BOOTLOADER ?= "bcm2835-bootfiles"
# Set initramfs extension
KERNEL_INITRAMFS ?= ""
# Boot partition volume id
BOOTDD_VOLUME_ID ?= "${MACHINE}"
@ -95,10 +98,10 @@ IMAGE_CMD_rpi-sdimg () {
case "${KERNEL_IMAGETYPE}" in
"uImage")
mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/u-boot.img ::kernel.img
mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}-${MACHINE}.bin ::uImage
mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}${KERNEL_INITRAMFS}-${MACHINE}.bin ::uImage
;;
*)
mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}-${MACHINE}.bin ::kernel.img
mcopy -i ${WORKDIR}/boot.img -s ${DEPLOY_DIR_IMAGE}/${KERNEL_IMAGETYPE}${KERNEL_INITRAMFS}-${MACHINE}.bin ::kernel.img
;;
esac