On lun., févr. 06, 2023 at 00:50, Safae Ouajih <[email protected]> wrote:
> Update the Android documentation to describe version 3 and 4 of boot > image header. > > Signed-off-by: Safae Ouajih <[email protected]> > --- Reviewed-by: Mattijs Korpershoek <[email protected]> > doc/android/boot-image.rst | 13 ++++++++++++- > 1 file changed, 12 insertions(+), 1 deletion(-) > > diff --git a/doc/android/boot-image.rst b/doc/android/boot-image.rst > index 71db02521b..c719b4d711 100644 > --- a/doc/android/boot-image.rst > +++ b/doc/android/boot-image.rst > @@ -27,11 +27,21 @@ next image headers: > * v2: used in devices launched with Android 10; adds ``dtb`` field, which > references payload containing DTB blobs (either concatenated one after the > other, or in Android DTBO image format) > +* v3: used in devices launched with Android 11; adds ``vendor_boot`` > partition > + and removes the second-stage bootloader and recovery image support. The new > + ``vendor_boot`` partition holds the device tree blob (DTB) and a vendor > ramdisk. > + The generic ramdisk in ``boot`` partition is loaded immediately following > + the vendor ramdisk. > +* v4: used in devices launched with Android 12; provides a boot signature in > boot > + image header, supports multiple vendor ramdisk fragments in ``vendor_boot`` > + partition. This version also adds a bootconfig section at the end of the > vendor > + boot image, this section contains boot configuration parameters known at > build time > + (see [9]_ for details). > > v2, v1 and v0 formats are backward compatible. > > The Android Boot Image format is represented by > -:c:type:`struct andr_img_hdr <andr_img_hdr>` in U-Boot, and can be seen in > +:c:type:`struct andr_image_data <andr_image_data>` in U-Boot, and can be > seen in > ``include/android_image.h``. U-Boot supports booting Android Boot Image and > also > has associated command > > @@ -153,3 +163,4 @@ References > .. [6] :doc:`avb2` > .. [7] https://source.android.com/devices/bootloader > .. [8] https://connect.linaro.org/resources/san19/san19-217/ > +.. [9] > https://source.android.com/docs/core/architecture/bootloader/implementing-bootconfig > -- > 2.34.1
