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image: allow building FIT and uImage with ramdisk

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Instead of embedding the initrd cpio archive into the kernel, allow
for having an external ramdisk added to the FIT or uImage.
This is useful to overcome kernel size limitations present in many
stock bootloaders, as the ramdisk is then loaded seperately and doesn't
add to the kernel size. Hence we can have larger ramdisks to host ie.
installers with all binaries to flash included (or a web-based
firmware selector).
In terms of performance and total size the differences are neglectible.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle
2021-02-21 14:19:26 +00:00
parent e6aac8d98f
commit 330bd380e8
6 changed files with 100 additions and 6 deletions
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21
config/Config-images.in
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@@ -35,9 +35,11 @@ menu "Target Images"
bool "lzma"
config TARGET_INITRAMFS_COMPRESSION_LZO
depends on !TARGET_ROOTFS_INITRAMFS_SEPERATE
bool "lzo"
config TARGET_INITRAMFS_COMPRESSION_LZ4
depends on !TARGET_ROOTFS_INITRAMFS_SEPERATE
bool "lz4"
config TARGET_INITRAMFS_COMPRESSION_XZ
@@ -56,11 +58,20 @@ menu "Target Images"
Kernel uses specified external cpio as INITRAMFS_SOURCE.
config TARGET_INITRAMFS_FORCE
bool "Force"
depends on TARGET_ROOTFS_INITRAMFS
default n
help
Ignore the initramfs passed by the bootloader.
bool "Force"
depends on TARGET_ROOTFS_INITRAMFS
default n
help
Ignore the initramfs passed by the bootloader.
config TARGET_ROOTFS_INITRAMFS_SEPERATE
bool "seperate ramdisk"
depends on TARGET_ROOTFS_INITRAMFS && !TARGET_INITRAMFS_FORCE
default y if USES_SEPERATE_INITRAMFS
help
Generate seperate initrd.cpio instead of embedding it.
This is useful for generating images with a dedicated
ramdisk e.g. in U-Boot's uImage and uImage.FIT formats.
comment "Root filesystem archives"