[PATCH] board: dragonboard410c: Load U-Boot directly without LK
Ramon Fried
rfried.dev at gmail.com
Sat Jul 10 21:07:28 CEST 2021
On Wed, Jul 7, 2021 at 12:06 PM Stephan Gerhold <stephan at gerhold.net> wrote:
>
> 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 at gmail.com>
> Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
> ---
>
> Related RFC with even more detailed explanations:
> https://lore.kernel.org/u-boot/YN2F1c926HFF+JA2@gerhold.net/
>
> In my tests both U-Boot and Linux are fully functional with this patch.
> However, I would appreciate further testing, since my testing does
> likely not represent a typical usage scenario for the DragonBoard 410c.
>
> When testing, please pick the following pending patch additionally:
> https://lore.kernel.org/u-boot/20210705121847.48432-1-stephan@gerhold.net/
> on top of u-boot/master.
>
> ---
> arch/arm/mach-snapdragon/Kconfig | 1 +
> arch/arm/mach-snapdragon/include/mach/boot0.h | 54 ++++++++
> board/qualcomm/dragonboard410c/MAINTAINERS | 1 +
> board/qualcomm/dragonboard410c/Makefile | 2 -
> .../dragonboard410c/dragonboard410c.c | 13 --
> board/qualcomm/dragonboard410c/head.S | 33 -----
> .../qualcomm/dragonboard410c/lowlevel_init.S | 27 ----
> board/qualcomm/dragonboard410c/readme.txt | 73 +----------
> board/qualcomm/dragonboard410c/u-boot.lds | 118 ------------------
> configs/dragonboard410c_defconfig | 2 +-
> doc/board/index.rst | 1 +
> doc/board/qualcomm/dragonboard410c.rst | 45 +++++++
> doc/board/qualcomm/index.rst | 9 ++
> include/configs/dragonboard410c.h | 3 +
> 14 files changed, 120 insertions(+), 262 deletions(-)
> create mode 100644 arch/arm/mach-snapdragon/include/mach/boot0.h
> delete mode 100644 board/qualcomm/dragonboard410c/head.S
> delete mode 100644 board/qualcomm/dragonboard410c/lowlevel_init.S
> delete mode 100644 board/qualcomm/dragonboard410c/u-boot.lds
> create mode 100644 doc/board/qualcomm/dragonboard410c.rst
> create mode 100644 doc/board/qualcomm/index.rst
>
> diff --git a/arch/arm/mach-snapdragon/Kconfig b/arch/arm/mach-snapdragon/Kconfig
> index e562d693c6..0ec74fa5d3 100644
> --- a/arch/arm/mach-snapdragon/Kconfig
> +++ b/arch/arm/mach-snapdragon/Kconfig
> @@ -15,6 +15,7 @@ choice
> config TARGET_DRAGONBOARD410C
> bool "96Boards Dragonboard 410C"
> select BOARD_LATE_INIT
> + select ENABLE_ARM_SOC_BOOT0_HOOK
> help
> Support for 96Boards Dragonboard 410C. This board complies with
> 96Board Open Platform Specifications. Features:
> diff --git a/arch/arm/mach-snapdragon/include/mach/boot0.h b/arch/arm/mach-snapdragon/include/mach/boot0.h
> new file mode 100644
> index 0000000000..953cccad79
> --- /dev/null
> +++ b/arch/arm/mach-snapdragon/include/mach/boot0.h
> @@ -0,0 +1,54 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Workaround for "PSCI bug" on DragonBoard 410c
> + * Copyright (C) 2021 Stephan Gerhold <stephan at gerhold.net>
> + *
> + * Syscall parameters taken from Qualcomm's LK fork (scm.h):
> + * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
> + *
> + * The PSCI implementation in the TrustZone/tz firmware on DragonBoard 410c has
> + * a bug that starts all other CPU cores in 32-bit mode unless the TZ syscall
> + * that switches from 32-bit to 64-bit mode is executed at least once.
> + *
> + * Normally this happens inside Qualcomm's LK bootloader which runs in 32-bit
> + * mode and uses the TZ syscall to boot a kernel in 64-bit mode. However, if
> + * U-Boot is installed to the "aboot" partition (replacing LK) the switch to
> + * 64-bit mode never happens since U-Boot is already running in 64-bit mode.
> + *
> + * A workaround for this "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.
> + */
> +#include <linux/arm-smccc.h>
> +
> +#define ARM_SMCCC_SIP32_FAST_CALL \
> + ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_32, ARM_SMCCC_OWNER_SIP, 0)
> +
> + /*
> + * U-Boot might be started in EL2 or EL3 with custom firmware.
> + * In that case, we assume that the workaround is not necessary or is
> + * handled already by the alternative firmware. Using the syscall in EL2
> + * would demote U-Boot to EL1; in EL3 it would probably just crash.
> + */
> + mrs x0, CurrentEL
> + cmp x0, #(1 << 2) /* EL1 */
> + bne reset
> +
> + /* Prepare TZ syscall parameters */
> + mov x0, #ARM_SMCCC_SIP32_FAST_CALL
> + movk x0, #0x10f /* SCM_SVC_MILESTONE_CMD_ID */
> + mov x1, #0x12 /* MAKE_SCM_ARGS(0x2, SMC_PARAM_TYPE_BUFFER_READ) */
> + adr x2, el1_system_param
> + mov x3, el1_system_param_end - el1_system_param
> +
> + /* Switch PSCI to 64-bit mode. Resets CPU and returns at el1_elr */
> + smc #0
> +
> + /* Something went wrong, perhaps PSCI is already in 64-bit mode? */
> + b reset
> +
> + .align 3
> +el1_system_param:
> + .quad 0, 0, 0, 0, 0, 0, 0, 0, 0 /* el1_x0-x8 */
> + .quad reset /* el1_elr */
> +el1_system_param_end:
> diff --git a/board/qualcomm/dragonboard410c/MAINTAINERS b/board/qualcomm/dragonboard410c/MAINTAINERS
> index 83448f5c13..e78f5b2d64 100644
> --- a/board/qualcomm/dragonboard410c/MAINTAINERS
> +++ b/board/qualcomm/dragonboard410c/MAINTAINERS
> @@ -4,3 +4,4 @@ S: Maintained
> F: board/qualcomm/dragonboard410c/
> F: include/configs/dragonboard410c.h
> F: configs/dragonboard410c_defconfig
> +F: doc/board/qualcomm/dragonboard410c.rst
> diff --git a/board/qualcomm/dragonboard410c/Makefile b/board/qualcomm/dragonboard410c/Makefile
> index 9b452041f4..1b99c8b0ef 100644
> --- a/board/qualcomm/dragonboard410c/Makefile
> +++ b/board/qualcomm/dragonboard410c/Makefile
> @@ -3,5 +3,3 @@
> # (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
>
> obj-y := dragonboard410c.o
> -obj-y += lowlevel_init.o
> -extra-y += head.o
> diff --git a/board/qualcomm/dragonboard410c/dragonboard410c.c b/board/qualcomm/dragonboard410c/dragonboard410c.c
> index 0d282de958..3b71881cac 100644
> --- a/board/qualcomm/dragonboard410c/dragonboard410c.c
> +++ b/board/qualcomm/dragonboard410c/dragonboard410c.c
> @@ -22,19 +22,6 @@
>
> DECLARE_GLOBAL_DATA_PTR;
>
> -/* pointer to the device tree ammended by the firmware */
> -extern void *fw_dtb;
> -
> -void *board_fdt_blob_setup(void)
> -{
> - if (fdt_magic(fw_dtb) != FDT_MAGIC) {
> - printf("Firmware provided invalid dtb!\n");
> - return NULL;
> - }
> -
> - return fw_dtb;
> -}
> -
> int dram_init(void)
> {
> gd->ram_size = PHYS_SDRAM_1_SIZE;
> diff --git a/board/qualcomm/dragonboard410c/head.S b/board/qualcomm/dragonboard410c/head.S
> deleted file mode 100644
> index 33e9d305f9..0000000000
> --- a/board/qualcomm/dragonboard410c/head.S
> +++ /dev/null
> @@ -1,33 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0+ */
> -/*
> - * ARM64 header for proper chain-loading with Little Kernel.
> - *
> - * Little Kernel shipped with Dragonboard410C boots standard Linux images for
> - * ARM64. This file adds header that is required to boot U-Boot properly.
> - *
> - * For details see:
> - * https://www.kernel.org/doc/Documentation/arm64/booting.txt
> - *
> - * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
> - */
> -
> -#include <config.h>
> -
> -.global _arm64_header
> -_arm64_header:
> - b _start
> - .word 0
> - /* Image load offset from start of RAM, little-endian */
> - .quad CONFIG_SYS_TEXT_BASE-PHYS_SDRAM_1
> - /* Effective size of kernel image, little-endian */
> - .quad 0 /* 0x60000 - ignored */
> - /* Informative flags, little-endian */
> - .quad 0
> - .quad 0 /* reserved */
> - .quad 0 /* reserved */
> - .quad 0 /* reserved */
> - .byte 0x41 /* Magic number, "ARM\x64" */
> - .byte 0x52
> - .byte 0x4d
> - .byte 0x64
> - .word 0 /* reserved */
> diff --git a/board/qualcomm/dragonboard410c/lowlevel_init.S b/board/qualcomm/dragonboard410c/lowlevel_init.S
> deleted file mode 100644
> index 762fed5617..0000000000
> --- a/board/qualcomm/dragonboard410c/lowlevel_init.S
> +++ /dev/null
> @@ -1,27 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0+ */
> -/*
> - * (C) Copyright 2016
> - * Cédric Schieli <cschieli at gmail.com>
> - */
> -
> -#include <config.h>
> -
> -.align 8
> -.global fw_dtb
> -fw_dtb:
> - .dword 0x0
> -
> -/*
> - * Routine: save_boot_params (called after reset from start.S)
> - * Description: save ATAG/FDT address provided by the firmware at boot time
> - */
> -
> -.global save_boot_params
> -save_boot_params:
> -
> - /* The firmware provided ATAG/FDT address can be found in r2/x0 */
> - adr x8, fw_dtb
> - str x0, [x8]
> -
> - /* Returns */
> - b save_boot_params_ret
> diff --git a/board/qualcomm/dragonboard410c/readme.txt b/board/qualcomm/dragonboard410c/readme.txt
> index a90d0f52e7..dfdb299fb7 100644
> --- a/board/qualcomm/dragonboard410c/readme.txt
> +++ b/board/qualcomm/dragonboard410c/readme.txt
> @@ -1,69 +1,6 @@
> -# SPDX-License-Identifier: GPL-2.0+
> -#
> -# (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
> +Documentation for DragonBoard 410c is now located at:
> + doc/board/qualcomm/dragonboard410c.rst
>
> -Build & Run instructions:
> -
> -1) Install mkbootimg and dtbTool from
> - git://codeaurora.org/quic/kernel/skales (15ece94f09 worked for me)
> -2) Setup CROSS_COMPILE to aarch64 compiler
> -3) make dragonboard410c_config
> -4) make
> -5) generate fake, empty ramdisk (can have 0 bytes)
> -$ touch rd
> -
> -6) Generate qualcomm device tree table with dtbTool [1]
> -$ dtbTool -o dt.img arch/arm/dts
> -
> -7) Generate Android boot image with mkbootimg [2]:
> -$ mkbootimg --kernel=u-boot-dtb.bin --output=u-boot.img --dt=dt.img \
> - --pagesize 2048 --base 0x80000000 --ramdisk=rd --cmdline=""
> -
> -8) Enter fastboot (reboot board with vol- button pressed)
> -
> -9) Boot it:
> -$ fastboot boot u-boot.img
> -or flash as kernel:
> -$ fastboot flash boot u-boot.img
> -$ fastboot reboot
> -
> -
> -What is working:
> -- UART
> -- GPIO (SoC)
> -- SD
> -- eMMC
> -- Reset
> -- USB in EHCI mode (usb starts does switch device->host, usb stop does the opposite)
> -- PMIC GPIOS (but not in generic subsystem)
> -- PMIC "special" buttons (power, vol-)
> -
> -What is not working / known bugs:
> -- SDHCI is slow (~2.5MiB/s for SD and eMMC)
> -
> -[1] To boot any kernel image, Little Kernel requires valid device tree for the
> -platform it runs on. dtbTool creates device tree table that Little Kernel scans.
> -Later on proper device tree is passed to next boot stage.
> -Full device tree is not required to boot u-boot. Enough would be:
> -/dts-v1/;
> -
> -/ {
> - model = "Qualcomm Technologies, Inc. Dragonboard 410c";
> - compatible = "qcom,dragonboard", "qcom,apq8016-sbc";
> - qcom,msm-id = <0xce 0x0 0xf8 0x0 0xf9 0x0 0xfa 0x0 0xf7 0x0>;
> - qcom,board-id = <0x10018 0x0>;
> - #address-cells = <0x2>;
> - #size-cells = <0x2>;
> - chosen { };
> - aliases { };
> -
> - memory {
> - device_type = "memory";
> - reg = <0 0x80000000 0 0x3da00000>;
> - };
> -};
> -
> -but for simplicity (and because size of image is not that critical) we use
> -existing Qualcomm device trees.
> -
> -[2] Note that ramdisk is required, even if it is unused.
> +Note that the installation method has changed: U-Boot is now installed into the
> +"aboot" partition (replacing Little Kernel/LK). It is no longer packaged into
> +an Android boot image and loaded through Qualcomm's LK bootloader.
> diff --git a/board/qualcomm/dragonboard410c/u-boot.lds b/board/qualcomm/dragonboard410c/u-boot.lds
> deleted file mode 100644
> index fc1bba8cf0..0000000000
> --- a/board/qualcomm/dragonboard410c/u-boot.lds
> +++ /dev/null
> @@ -1,118 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0+ */
> -/*
> - * Override linker script for fastboot-readable images
> - *
> - * (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski at gmail.com>
> - *
> - * Based on arch/arm/cpu/armv8/u-boot.lds (Just add header)
> - */
> -
> -OUTPUT_FORMAT("elf64-littleaarch64", "elf64-littleaarch64", "elf64-littleaarch64")
> -OUTPUT_ARCH(aarch64)
> -ENTRY(_arm64_header)
> -SECTIONS
> -{
> - . = 0x00000000;
> -
> - . = ALIGN(8);
> - .text :
> - {
> - *(.__image_copy_start)
> - board/qualcomm/dragonboard410c/head.o (.text*)
> - CPUDIR/start.o (.text*)
> - }
> -
> - /* This needs to come before *(.text*) */
> - .efi_runtime : {
> - __efi_runtime_start = .;
> - *(.text.efi_runtime*)
> - *(.rodata.efi_runtime*)
> - *(.data.efi_runtime*)
> - __efi_runtime_stop = .;
> - }
> -
> - .text_rest :
> - {
> - *(.text*)
> - }
> -
> - . = ALIGN(8);
> - .rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
> -
> - . = ALIGN(8);
> - .data : {
> - *(.data*)
> - }
> -
> - . = ALIGN(8);
> -
> - . = .;
> -
> - . = ALIGN(8);
> - .u_boot_list : {
> - KEEP(*(SORT(.u_boot_list*)));
> - }
> -
> - . = ALIGN(8);
> -
> - .efi_runtime : {
> - __efi_runtime_start = .;
> - *(efi_runtime_text)
> - *(efi_runtime_data)
> - __efi_runtime_stop = .;
> - }
> -
> - .efi_runtime_rel : {
> - __efi_runtime_rel_start = .;
> - *(.rel*.efi_runtime)
> - *(.rel*.efi_runtime.*)
> - __efi_runtime_rel_stop = .;
> - }
> -
> - . = ALIGN(8);
> -
> - .image_copy_end :
> - {
> - *(.__image_copy_end)
> - }
> -
> - . = ALIGN(8);
> -
> - .rel_dyn_start :
> - {
> - *(.__rel_dyn_start)
> - }
> -
> - .rela.dyn : {
> - *(.rela*)
> - }
> -
> - .rel_dyn_end :
> - {
> - *(.__rel_dyn_end)
> - }
> -
> - _end = .;
> -
> - . = ALIGN(8);
> -
> - .bss_start : {
> - KEEP(*(.__bss_start));
> - }
> -
> - .bss : {
> - *(.bss*)
> - . = ALIGN(8);
> - }
> -
> - .bss_end : {
> - KEEP(*(.__bss_end));
> - }
> -
> - /DISCARD/ : { *(.dynsym) }
> - /DISCARD/ : { *(.dynstr*) }
> - /DISCARD/ : { *(.dynamic*) }
> - /DISCARD/ : { *(.plt*) }
> - /DISCARD/ : { *(.interp*) }
> - /DISCARD/ : { *(.gnu*) }
> -}
> diff --git a/configs/dragonboard410c_defconfig b/configs/dragonboard410c_defconfig
> index 7b7b32c0a2..dc9d0d893c 100644
> --- a/configs/dragonboard410c_defconfig
> +++ b/configs/dragonboard410c_defconfig
> @@ -1,6 +1,6 @@
> CONFIG_ARM=y
> CONFIG_ARCH_SNAPDRAGON=y
> -CONFIG_SYS_TEXT_BASE=0x80080000
> +CONFIG_SYS_TEXT_BASE=0x8f600000
> CONFIG_NR_DRAM_BANKS=1
> CONFIG_ENV_SIZE=0x2000
> CONFIG_ENV_OFFSET=0x0
> diff --git a/doc/board/index.rst b/doc/board/index.rst
> index 196b597609..a6b395238a 100644
> --- a/doc/board/index.rst
> +++ b/doc/board/index.rst
> @@ -20,6 +20,7 @@ Board-specific doc
> kontron/index
> microchip/index
> openpiton/index
> + qualcomm/index
> rockchip/index
> sifive/index
> sipeed/index
> diff --git a/doc/board/qualcomm/dragonboard410c.rst b/doc/board/qualcomm/dragonboard410c.rst
> new file mode 100644
> index 0000000000..d0de9dbcbc
> --- /dev/null
> +++ b/doc/board/qualcomm/dragonboard410c.rst
> @@ -0,0 +1,45 @@
> +.. SPDX-License-Identifier: GPL-2.0+
> +.. sectionauthor:: Stephan Gerhold <stephan at gerhold.net>
> +
> +DragonBoard 410c
> +================
> +
> +The DragonBoard 410c is a development board based on the Qualcomm APQ8016E SoC.
> +More information can be found on the `96Boards product page`_.
> +
> +U-Boot can be used as a replacement for Qualcomm's original Android bootloader
> +(a fork of Little Kernel/LK). Like LK, it is installed directly into the ``aboot``
> +partition. Note that the U-Boot port used to be loaded as an Android boot image
> +through LK. This is no longer the case, now U-Boot can replace LK entirely.
> +
> +.. _96Boards product page: https://www.96boards.org/product/dragonboard410c/
> +
> +Installation
> +------------
> +First, setup ``CROSS_COMPILE`` for aarch64. Then, build U-Boot for ``dragonboard410c``::
> +
> + $ export CROSS_COMPILE=<aarch64 toolchain prefix>
> + $ make dragonboard410c_defconfig
> + $ make
> +
> +This will build ``u-boot.elf`` in the configured output directory.
> +
> +Although the DragonBoard 410c does not have secure boot set up by default,
> +the firmware still expects firmware ELF images to be "signed". The signature
> +does not provide any security in this case, but it provides the firmware with
> +some required metadata.
> +
> +To "sign" ``u-boot.elf`` you can use e.g. `qtestsign`_::
> +
> + $ ./qtestsign.py aboot u-boot.elf
> +
> +Then install the resulting ``u-boot-test-signed.mbn`` to the ``aboot`` partition
> +on your device, e.g. with ``fastboot flash aboot u-boot-test-signed.mbn``.
> +
> +U-Boot should be running after a reboot (``fastboot reboot``).
> +
> +.. _qtestsign: https://github.com/msm8916-mainline/qtestsign
> +
> +Usage
> +-----
> +Press Volume Down during boot to enter Fastboot mode.
> diff --git a/doc/board/qualcomm/index.rst b/doc/board/qualcomm/index.rst
> new file mode 100644
> index 0000000000..f7e0aa9298
> --- /dev/null
> +++ b/doc/board/qualcomm/index.rst
> @@ -0,0 +1,9 @@
> +.. SPDX-License-Identifier: GPL-2.0+
> +
> +Qualcomm
> +========
> +
> +.. toctree::
> + :maxdepth: 2
> +
> + dragonboard410c
> diff --git a/include/configs/dragonboard410c.h b/include/configs/dragonboard410c.h
> index 65537e4778..1f08508c4d 100644
> --- a/include/configs/dragonboard410c.h
> +++ b/include/configs/dragonboard410c.h
> @@ -11,6 +11,9 @@
> #include <linux/sizes.h>
> #include <asm/arch/sysmap-apq8016.h>
>
> +/* Build new ELF image from u-boot.bin (U-Boot + appended DTB) */
> +#define CONFIG_REMAKE_ELF
> +
> /* Physical Memory Map */
> #define PHYS_SDRAM_1 0x80000000
> /* 1008 MB (the last ~30Mb are secured for TrustZone by ATF*/
> --
> 2.32.0
>
Thanks Stephan, it looks very good.
I started testing it, it builds correctly and I flashed and everything
seems to work.
I do have a problem with my TFTP setup, so I didn't boot Linux yet,
but I will get to it, if it will boot successfully we can merge this
one.
U-boot doesn't know how to boot qcom android kernel partitions, I'm
not sure this is something I even want to start supporting in U-boot.
Nico, do you think you can change the format of the BOOT partition to
host a u-boot FIT image ?
Thanks,
Ramon
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