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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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2
common/bootm.c
View file

@ -154,7 +154,7 @@ static int bootm_find_os(cmd_tbl_t *cmdtp, int flag, int argc,
#ifdef CONFIG_ANDROID_BOOT_IMAGE
case IMAGE_FORMAT_ANDROID:
images.os.type = IH_TYPE_KERNEL;
images.os.comp = IH_COMP_NONE;
images.os.comp = android_image_get_kcomp(os_hdr);
images.os.os = IH_OS_LINUX;
images.os.end = android_image_get_end(os_hdr);

11
common/image-android.c
View file

@ -8,6 +8,7 @@
#include <android_image.h>
#include <malloc.h>
#include <errno.h>
#include <asm/unaligned.h>
#define ANDROID_IMAGE_DEFAULT_KERNEL_ADDR 0x10008000
@ -126,6 +127,16 @@ ulong android_image_get_kload(const struct andr_img_hdr *hdr)
return android_image_get_kernel_addr(hdr);
}
ulong android_image_get_kcomp(const struct andr_img_hdr *hdr)
{
const void *p = (void *)((uintptr_t)hdr + hdr->page_size);
if (get_unaligned_le32(p) == LZ4F_MAGIC)
return IH_COMP_LZ4;
else
return IH_COMP_NONE;
}
int android_image_get_ramdisk(const struct andr_img_hdr *hdr,
ulong *rd_data, ulong *rd_len)
{

2
include/image.h
View file

@ -306,6 +306,7 @@ enum {
IH_COMP_COUNT,
};
#define LZ4F_MAGIC 0x184D2204 /* LZ4 Magic Number */
#define IH_MAGIC 0x27051956 /* Image Magic Number */
#define IH_NMLEN 32 /* Image Name Length */
@ -1312,6 +1313,7 @@ int android_image_get_second(const struct andr_img_hdr *hdr,
ulong *second_data, ulong *second_len);
ulong android_image_get_end(const struct andr_img_hdr *hdr);
ulong android_image_get_kload(const struct andr_img_hdr *hdr);
ulong android_image_get_kcomp(const struct andr_img_hdr *hdr);
void android_print_contents(const struct andr_img_hdr *hdr);
#endif /* CONFIG_ANDROID_BOOT_IMAGE */

3
lib/lz4_wrapper.c
View file

@ -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 {