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: I4d8e532ead5c4775b2eef9272e6121565083d9a0

diff --git a/tizen/bootscript/tizen-boot-lpi4a.scr b/tizen/bootscript/tizen-boot-lpi4a.scr
index b6d4f291626c449536ddfb2ece6858cd20e136d3..aa834e92e7402d9673e814bc264079921d0d5e0a 100644 (file)
--- a/tizen/bootscript/tizen-boot-lpi4a.scr
+++ b/tizen/bootscript/tizen-boot-lpi4a.scr
@@ -81,6 +81,10 @@ 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