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image: android: allow booting lz4-compressed kernels

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According to Android image format [1], kernel image resides at 1 page
offset from the boot image address. Grab the magic number from there
and allow U-Boot to handle LZ4-compressed KNL binaries instead of
hardcoding compression type to IH_COMP_NONE. Other compression types,
if needed, can be added later.

Tested on H3ULCB-KF using the image detailed in [2].

[1] Excerpt from include/android_image.h
    +-----------------+
    | boot header     | 1 page
    +-----------------+
    | kernel          | n pages
    +-----------------+
    | ramdisk         | m pages
    +-----------------+
    | second stage    | o pages
    +-----------------+

[2] => iminfo 4c000000
    ## Checking Image at 4c000000 ...
    Android image found
    kernel size:      85b9d1
    kernel address:   48080000
    ramdisk size:     54ddbc
    ramdisk addrress: 4a180000
    second size:      0
    second address:   48000800
    tags address:     48000100
    page size:        800
    os_version:       1200012a (ver: 0.9.0, level: 2018.10)
    name:
    cmdline:          buildvariant=userdebug

Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
This commit is contained in:
Eugeniu Rosca
2019-04-08 17:35:27 +02:00
committed by Tom Rini
parent 0efe2b8f9e
commit 829ceb2821
4 changed files with 15 additions and 3 deletions
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3
lib/lz4_wrapper.c
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@@ -5,6 +5,7 @@
#include <common.h>
#include <compiler.h>
#include <image.h>
#include <linux/kernel.h>
#include <linux/types.h>
@@ -23,8 +24,6 @@ typedef uint64_t U64;
/* Unaltered (except removing unrelated code) from github.com/Cyan4973/lz4. */
#include "lz4.c" /* #include for inlining, do not link! */
#define LZ4F_MAGIC 0x184D2204
struct lz4_frame_header {
u32 magic;
union {