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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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28
scripts/mkits.sh
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@@ -24,6 +24,7 @@ usage() {
printf "\n\t-a ==> set load address to 'addr' (hex)"
printf "\n\t-e ==> set entry point to 'entry' (hex)"
printf "\n\t-f ==> set device tree compatible string"
printf "\n\t-i ==> include initrd Blob 'initrd'"
printf "\n\t-v ==> set kernel version to 'version'"
printf "\n\t-k ==> include kernel image 'kernel'"
printf "\n\t-D ==> human friendly Device Tree Blob 'name'"
@@ -37,10 +38,11 @@ usage() {
FDTNUM=1
ROOTFSNUM=1
INITRDNUM=1
HASH=sha1
LOADABLES=
while getopts ":A:a:c:C:D:d:e:f:k:n:o:v:r:S" OPTION
while getopts ":A:a:c:C:D:d:e:f:i:k:n:o:v:r:S" OPTION
do
case $OPTION in
A ) ARCH=$OPTARG;;
@@ -51,6 +53,7 @@ do
d ) DTB=$OPTARG;;
e ) ENTRY_ADDR=$OPTARG;;
f ) COMPATIBLE=$OPTARG;;
i ) INITRD=$OPTARG;;
k ) KERNEL=$OPTARG;;
n ) FDTNUM=$OPTARG;;
o ) OUTPUT=$OPTARG;;
@@ -96,6 +99,27 @@ if [ -n "${DTB}" ]; then
FDT_PROP="fdt = \"fdt@$FDTNUM\";"
fi
if [ -n "${INITRD}" ]; then
INITRD_NODE="
initrd@$INITRDNUM {
description = \"${ARCH_UPPER} OpenWrt ${DEVICE} initrd\";
${COMPATIBLE_PROP}
data = /incbin/(\"${INITRD}\");
type = \"ramdisk\";
arch = \"${ARCH}\";
os = \"linux\";
hash@1 {
algo = \"crc32\";
};
hash@2 {
algo = \"${HASH}\";
};
};
"
INITRD_PROP="ramdisk=\"initrd@${INITRDNUM}\";"
fi
if [ -n "${ROOTFS}" ]; then
dd if="${ROOTFS}" of="${ROOTFS}.pagesync" bs=4096 conv=sync
ROOTFS_NODE="
@@ -141,6 +165,7 @@ DATA="/dts-v1/;
algo = \"$HASH\";
};
};
${INITRD_NODE}
${FDT_NODE}
${ROOTFS_NODE}
};
@@ -153,6 +178,7 @@ ${ROOTFS_NODE}
${FDT_PROP}
${LOADABLES:+loadables = ${LOADABLES};}
${COMPATIBLE_PROP}
${INITRD_PROP}
};
};
};"