Linux/u-boot-bpi-r3
1
0
Fork 0
mirror of https://github.com/frank-w/u-boot.git synced 2026-01-11 12:49:06 +08:00
Code Issues Packages Projects Releases Wiki Activity

image: android: Add functions for handling dtb field

Browse Source 
Android Boot Image v2 adds "DTB" payload (and corresponding field in the
image header). Provide functions for its handling:

  - android_image_get_dtb_by_index(): Obtain DTB blob from "DTB" part of
    boot image, by blob's index
  - android_image_print_dtb_contents(): Iterate over all DTB blobs in
    "DTB" part of boot image and print those blobs info

"DTB" payload might be in one of the following formats:
  1. concatenated DTB blobs
  2. Android DTBO format

The latter requires "android-image-dt.c" functionality, so this commit
selects that file for building for CONFIG_ANDROID_BOOT_IMAGE option.

Right now this new functionality isn't used, but it can be used further.
As it's required to apply some specific dtbo blob(s) from "dtbo"
partition, we can't automate this process inside of "bootm" command. But
we can do next:
  - come up with some new command like "abootimg" to extract dtb blob
    from boot image (using functions from this patch)
  - extract desired dtbo blobs from "dtbo" partition using "adtimg"
    command
  - merge dtbo blobs into dtb blob using "fdt apply" command
  - pass resulting dtb blob into bootm command in order to boot the
    Android kernel with Android ramdisk from boot image

Signed-off-by: Sam Protsenko <joe.skb7@gmail.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
This commit is contained in:
Sam Protsenko
2020-01-24 17:53:40 +02:00
committed by Lokesh Vutla
parent 31a790bee9
commit c3bfad825a
3 changed files with 227 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
include/image.h
View File

@@ -1425,10 +1425,15 @@ int android_image_get_ramdisk(const struct andr_img_hdr *hdr,
ulong *rd_data, ulong *rd_len);
int android_image_get_second(const struct andr_img_hdr *hdr,
ulong *second_data, ulong *second_len);
bool android_image_get_dtb_by_index(ulong hdr_addr, u32 index, ulong *addr,
u32 *size);
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);
#if !defined(CONFIG_SPL_BUILD)
bool android_image_print_dtb_contents(ulong hdr_addr);
#endif
#endif /* CONFIG_ANDROID_BOOT_IMAGE */