tizen: bootscript: amlogic: 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.

In case of Amlogic based boards boot script, kernel load address has to
be recalculated and adjusted to next the 4k page boundary.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Change-Id: I2b1a6e46237ad2de37154154b2a50959aacfa1a1

diff --git a/tizen/bootscript/tizen-boot-amlogic-64b.scr b/tizen/bootscript/tizen-boot-amlogic-64b.scr
index 2b159d69c695ff4742ce613bbf1b0c206d73dc54..aa61c37b5926d79beee9dea6946dc495edeebcae 100644 (file)
--- a/tizen/bootscript/tizen-boot-amlogic-64b.scr
+++ b/tizen/bootscript/tizen-boot-amlogic-64b.scr
@@ -109,6 +109,16 @@ else
                setenv rootdev ram0
                echo "Loading initramfs from partition ${ramdiskpart}";
                mmc read $ramdisk_addr_r $ramdisk_start $ramdisk_size;
+               setexpr ramdisk2_addr_r $ramdisk_addr_r + $ramdisksize
+               unzip $ramdisk_addr_r $ramdisk2_addr_r
+               setenv ramdisksize $filesize
+               setenv ramdisk_addr_r $ramdisk2_addr_r
+               setexpr tizen_kernel_addr_r $ramdisk_addr_r + $ramdisksize
+
+               # Round tizen_kernel_addr_r to the next 4k page boundary
+               setexpr tizen_kernel_addr_r $tizen_kernel_addr_r / 0x1000
+               setexpr tizen_kernel_addr_r $tizen_kernel_addr_r + 1
+               setexpr tizen_kernel_addr_r $tizen_kernel_addr_r * 0x1000
        else
                setenv rootdev mmcblk${mmcrootdev}p${mmcrootpart}
                setenv bootmode normal