u-boot/arch/arm/mach-snapdragon/Kconfig

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if ARCH_SNAPDRAGON
config SYS_SOC
default "snapdragon"
config SYS_MALLOC_F_LEN
default 0x2000
config SPL_SYS_MALLOC_F
default y
config SPL_SYS_MALLOC_F_LEN
default 0x2000
config SDM845
bool "Qualcomm Snapdragon 845 SoC"
default n
select LINUX_KERNEL_IMAGE_HEADER
config LNX_KRNL_IMG_TEXT_OFFSET_BASE
default 0x80000000
choice
prompt "Snapdragon board select"
config TARGET_DRAGONBOARD410C
bool "96Boards Dragonboard 410C"
select BOARD_LATE_INIT
board: dragonboard410c: Load U-Boot directly without LK At the moment the U-Boot port for the DragonBoard 410c is designed to be loaded as an Android boot image after Qualcomm's Little Kernel (LK) bootloader. This is simple to set up but LK is redundant in this case, since everything done by LK can be also done directly by U-Boot. Dropping LK entirely has at least the following advantages: - Easier installation/board code (no need for Android boot images) - (Slightly) faster boot - Boot directly in 64-bit without a round trip to 32-bit for LK So far this was not possible yet because of unsolved problems: 1. Signing tool: The firmware expects a "signed" ELF image with extra (Qualcomm-specific) ELF headers, usually used for secure boot. The DragonBoard 410c does not have secure boot by default but the extra ELF headers are still required. 2. PSCI bug: There seems to be a bug in the PSCI implementation (part of the TrustZone/tz firmware) that causes all other CPU cores to be started in 32-bit mode if LK is missing in the boot chain. This causes Linux to hang early during boot. There is a solution for both problems now: 1. qtestsign (https://github.com/msm8916-mainline/qtestsign) can be used as a "signing" tool for U-Boot and other firmware. 2. A workaround for the "PSCI bug" is to execute the TZ syscall when entering U-Boot. That way PSCI is made aware of the 64-bit switch and starts all other CPU cores in 64-bit mode as well. Simplify the dragonboard410c board by removing all the extra code that is only used to build an Android boot image that can be loaded by LK. This allows dropping the custom linker script, special image magic, as well as most of the special build/installation instructions. CONFIG_REMAKE_ELF is used to build a new ELF image that has both U-Boot and the appended DTB combined. The resulting u-boot.elf can then be passed to the "signing" tool (e.g. qtestsign). The PSCI workaround is placed in the "boot0" hook that is enabled with CONFIG_ENABLE_ARM_SOC_BOOT0_HOOK. The extra check for EL1 allows compatibility with custom firmware that enters U-Boot in EL2 or EL3, e.g. qhypstub (https://github.com/msm8916-mainline/qhypstub). As a first step these changes apply only to DragonBoard410c. Similar changes could likely also work for the DragonBoard 820c. Note that removing LK wouldn't be possible that easily without a lot of work already done three years ago by Ramon Fried. A lot of missing initialization, pinctrl etc was already added back then even though it was not strictly needed yet. Cc: Ramon Fried <rfried.dev@gmail.com> Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
2021-07-07 09:06:02 +00:00
select ENABLE_ARM_SOC_BOOT0_HOOK
help
Support for 96Boards Dragonboard 410C. This board complies with
96Board Open Platform Specifications. Features:
- Qualcomm Snapdragon 410C SoC - APQ8016 (4xCortex A53, Adreno 306)
- 1GiB RAM
- 8GiB eMMC, uSD slot
- WiFi, Bluetooth and GPS module
- 2x Host, 1x Device USB port
- HDMI
- 20-pin low speed and 40-pin high speed expanders, 4 LED, 3 buttons
config TARGET_DRAGONBOARD820C
bool "96Boards Dragonboard 820C"
help
Support for 96Boards Dragonboard 820C. This board complies with
96Board Open Platform Specifications. Features:
- Qualcomm Snapdragon 820C SoC - APQ8096 (4xKyro CPU)
- 3GiB RAM
- 32GiB UFS drive
config TARGET_DRAGONBOARD845C
bool "96Boards Dragonboard 845C"
help
Support for 96Boards Dragonboard 845C aka Robotics RB3 Development
Platform. This board complies with 96Boards Open Platform
Specifications. Features:
- Qualcomm Snapdragon SDA845 SoC
- 4GiB RAM
- 64GiB UFS drive
select MISC_INIT_R
select SDM845
config TARGET_STARQLTECHN
bool "Samsung S9 SM-G9600(starqltechn)"
help
Support for Samsung S9 SM-G9600(starqltechn) board.
Features:
- Qualcomm Snapdragon SDM845 SoC
- 4GiB RAM
- 64GiB UFS drive
select MISC_INIT_R
select SDM845
config TARGET_QCS404EVB
bool "Qualcomm Technologies, Inc. QCS404 EVB"
select LINUX_KERNEL_IMAGE_HEADER
help
Support for Qualcomm Technologies, Inc. QCS404 evaluation board.
Features:
- Qualcomm Snapdragon QCS404 SoC
- 1GiB RAM
- 8GiB eMMC, uSD slot
endchoice
source "board/qualcomm/dragonboard410c/Kconfig"
source "board/qualcomm/dragonboard820c/Kconfig"
source "board/qualcomm/dragonboard845c/Kconfig"
source "board/samsung/starqltechn/Kconfig"
source "board/qualcomm/qcs404-evb/Kconfig"
endif