Android 10 adds support for dynamic partitions and in order to support them userspace fastboot must be used[1]. New tool called fastbootd is included into recovery image.
Userspace fastboot works from recovery and is launched if: 1) - Dynamic partitioning is enabled 2) - Boot control block has 'boot-fastboot' value into command field
The bootloader is expected[2] to load and boot into the recovery image upon seeing boot-fastboot in the BCB command. Recovery then parses the BCB message and switches to fastbootd mode.
Please note that boot script is expected to handle 'boot-fastboot' command in BCB and load into recovery mode.
Bootloader must support[3] 'reboot fastboot' command which should reboot device into userspace fastboot to accomodate those changes.
Another command that bootloader must support[3] is 'reboot recovery'. This command should simply reboot device into recovery mode.
Changes since v4[7]: * Moved BCB commands table next to reboot reasons enum to avoid issues in future with keeping them in sync * Changed command buffer size to 64 to fix issue with longer string in case of bootonce-bootloader command
Changes since v3[6]: * Fixed indentation in Kconfig * Fixed default value for FASTBOOT_USE_BCB_SET_REBOOT_FLAG * Extended help message for FASTBOOT_USE_BCB_SET_REBOOT_FLAG
Changes since v2[5]: * Split patch 1 into two separate patches: * Patch 1 extends fastboot_set_reboot_flag arguments with reboot reason * Patch 2 adds new reboot reasons for fastbootd and recovery * Added name for fastboot_rebot_reason enum * Replaced switch inside fastboot_set_reboot_flag with table lookup * Moved fastboot_set_reboot_flag BCB implementation to separate file
Changes since v1[4]: * Added missing handling of reboot commands for network protocol * Extended fastboot_set_reboot_flag command to accept reboot reason * Made former fastboot_set_flag function as an optional implementation of fastboot_set_reboot_flag which could be turned on by Kconfig
[1] - https://source.android.com/devices/bootloader/fastbootd [2] - https://source.android.com/devices/bootloader/fastbootd#unified_fastboot_and... [3] - https://source.android.com/devices/bootloader/fastbootd#modifications_to_the... [4] - http://patchwork.ozlabs.org/project/uboot/cover/cover.1590539734.git.roman.k... [5] - http://patchwork.ozlabs.org/project/uboot/cover/cover.1591254465.git.roman.k... [6] - http://patchwork.ozlabs.org/project/uboot/cover/cover.1591806433.git.roman.k... [7] - http://patchwork.ozlabs.org/project/uboot/cover/cover.1592871839.git.roman.k...
Roman Kovalivskyi (3): fastboot: Extend fastboot_set_reboot_flag with reboot reason fastboot: Add support for 'reboot fastboot' command fastboot: Add default fastboot_set_reboot_flag implementation
arch/arm/mach-meson/board-common.c | 6 ++++- arch/arm/mach-rockchip/board.c | 6 ++++- board/amazon/kc1/kc1.c | 6 ++++- board/lg/sniper/sniper.c | 6 ++++- board/ti/am57xx/board.c | 6 ++++- board/ti/dra7xx/evm.c | 6 ++++- drivers/fastboot/Kconfig | 12 +++++++++ drivers/fastboot/Makefile | 1 + drivers/fastboot/fb_bcb_impl.c | 43 ++++++++++++++++++++++++++++++ drivers/fastboot/fb_command.c | 40 ++++++++++++++++++++++++++- drivers/fastboot/fb_common.c | 2 +- drivers/usb/gadget/f_fastboot.c | 2 ++ include/fastboot.h | 23 +++++++++++++++- net/fastboot.c | 2 ++ 14 files changed, 152 insertions(+), 9 deletions(-) create mode 100644 drivers/fastboot/fb_bcb_impl.c