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rootfs-cpio: add U-Boot image support 

Adds U-Boot image support for cpio root filesystems. This allows you to
use the bootm command in U-Boot to load the rootfs. It makes it possible to
verify the CRC of the initramfs before booting the kernel.

[Spenser: wrote first version of the patch.]
Signed-off-by: Spenser Gilliland <spenser@gillilanding.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Arnout Vandecappelle 2013-11-07 00:12:34 +01:00 committed by Peter Korsgaard
parent 4df9ecb30a
commit 3970ebf837
2 changed files with 33 additions and 1 deletions
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13
fs/cpio/Config.in
View File

@ -5,10 +5,11 @@ config BR2_TARGET_ROOTFS_CPIO
used for an initial RAM filesystem that is passed to the kernel
by the bootloader.
if BR2_TARGET_ROOTFS_CPIO
choice
prompt "Compression method"
default BR2_TARGET_ROOTFS_CPIO_NONE
depends on BR2_TARGET_ROOTFS_CPIO
help
Select compressor for cpio filesystem of the root filesystem.
If you use the cpio archive as an initial RAM filesystem, make
@ -47,3 +48,13 @@ config BR2_TARGET_ROOTFS_CPIO_XZ
endchoice
config BR2_TARGET_ROOTFS_CPIO_UIMAGE
bool "Create U-Boot image of the root filesystem"
select BR2_PACKAGE_HOST_UBOOT_TOOLS
help
Add a U-Boot header to the cpio root filesystem. This allows
the initramfs to be loaded with the bootm command in U-Boot.
The U-Boot image will be called rootfs.cpio.uboot
endif # BR2_TARGET_ROOTFS_CPIO

21
fs/cpio/cpio.mk
View File

@ -31,4 +31,25 @@ define ROOTFS_CPIO_CMD
cd $(TARGET_DIR) && find . | cpio --quiet -o -H newc > $@
endef
# mkimage supports arm avr32 blackfin m68k microblaze mips mips64 nios2 powerpc ppc sh sparc sparc64 x86
# KERNEL_ARCH can be arm64 arc arm avr32 blackfin m68k microblaze mips nios2 powerpc sh sparc i386 x86_64 xtensa
# For arm64, arc, xtensa we'll just keep KERNEL_ARCH
# For mips64, we'll just keep mips
# For i386 and x86_64, we need to convert
ifeq ($(KERNEL_ARCH),x86_64)
UIMAGE_ARCH = x86
else ifeq ($(KERNEL_ARCH),i386)
UIMAGE_ARCH = x86
else
UIMAGE_ARCH = $(KERNEL_ARCH)
endif
$(BINARIES_DIR)/rootfs.cpio.uboot: $(BINARIES_DIR)/rootfs.cpio host-uboot-tools
$(HOST_DIR)/usr/bin/mkimage -A $(UIMAGE_ARCH) -T ramdisk \
-C none -d $<$(ROOTFS_CPIO_COMPRESS_EXT) $@
ifeq ($(BR2_TARGET_ROOTFS_CPIO_UIMAGE),y)
ROOTFS_CPIO_POST_TARGETS += $(BINARIES_DIR)/rootfs.cpio.uboot
endif
$(eval $(call ROOTFS_TARGET,cpio))