From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Mon, 7 Oct 2024 08:48:01 +0000 (+0200)
Subject: tizen: bootscript: unpack initramfs and pass its actual size to kernel
X-Git-Tag: accepted/tizen/unified/20241126.175211~13
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5fbae960171a08d2af0dbec13e8453cebc019ca0;p=platform%2Fkernel%2Fu-boot.git

tizen: bootscript: unpack initramfs and pass its actual size to kernel

The initramfs ramdisk image (CPIO compressed archive) is stored on the
separate ramdisk/ramdisk-recovery partitions, thus it is not possible to
determine size of the compresszed archive. Passing the size of the
partition as the size of initramfs image to the kernel instructs the
kernel to check if the remaining bytes are another CPIO archive with more
initramfs data.

Decompressing or interpreting such additional garbage bytes sometimes
fails, what results in kernel ignoring the whole initramfs data as broken
one and thus breaking the Tizen boot sequence.

To avoid such problems and dependency on unknown/garbage data from
ramdisk partitions, lets decompres initramfs data (CPIO gzip archive)
directly in u-boot and pass the kernel only the single, uncompressed CPIO
archive as iniramfs image.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Change-Id: Ic373477589e2b29f7bf89c803241bc29d6c7b983
---

diff --git a/tizen/bootscript/tizen-boot-rpi4.scr b/tizen/bootscript/tizen-boot-rpi4.scr
index b284cea662..6e7c495880 100644
--- a/tizen/bootscript/tizen-boot-rpi4.scr
+++ b/tizen/bootscript/tizen-boot-rpi4.scr
@@ -120,6 +120,10 @@ if test -e $devtype $devnum:$ramdiskpart sbin/init; then;
 elif itest.w *$ramdisk_addr_r == 0x8b1f; then;	# check for gzip (initramfs) magic
 	echo "Using initramfs from partition ${ramdiskpart}";
 	setenv rootargs
+	setexpr ramdisk2_addr_r $ramdisk_addr_r + $ramdisk_size
+	unzip $ramdisk_addr_r $ramdisk2_addr_r
+	setenv ramdisk_size $filesize
+	setenv ramdisk_addr_r $ramdisk2_addr_r
 else
 	echo "Booting without initrd/initramfs";
 	setenv bootmode normal
diff --git a/tizen/bootscript/tizen-boot-vf2.scr b/tizen/bootscript/tizen-boot-vf2.scr
index 89ccbf94cb..1ef0d36527 100644
--- a/tizen/bootscript/tizen-boot-vf2.scr
+++ b/tizen/bootscript/tizen-boot-vf2.scr
@@ -103,6 +103,10 @@ if test -e $devtype $devnum:$ramdiskpart sbin/init; then;
 elif itest.w *$ramdisk_addr_r == 0x8b1f; then;	# check for gzip (initramfs) magic
 	echo "Using initramfs from partition ${ramdiskpart}";
 	setenv rootargs
+	setexpr ramdisk2_addr_r $ramdisk_addr_r + $ramdisk_size
+	unzip $ramdisk_addr_r $ramdisk2_addr_r
+	setenv ramdisk_size $filesize
+	setenv ramdisk_addr_r $ramdisk2_addr_r
 else
 	echo "Booting without initrd/initramfs";
 	setenv bootmode normal