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0204d1b56b
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>
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Board configuration file for Dragonboard 410C
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*
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* (C) Copyright 2015 Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
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*/
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#ifndef __CONFIGS_DRAGONBOARD410C_H
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#define __CONFIGS_DRAGONBOARD410C_H
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#include <linux/sizes.h>
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#include <asm/arch/sysmap-apq8016.h>
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/* Build new ELF image from u-boot.bin (U-Boot + appended DTB) */
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#define CONFIG_REMAKE_ELF
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/* Physical Memory Map */
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#define PHYS_SDRAM_1 0x80000000
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/* 1008 MB (the last ~30Mb are secured for TrustZone by ATF*/
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#define PHYS_SDRAM_1_SIZE 0x3da00000
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#define CONFIG_SYS_SDRAM_BASE PHYS_SDRAM_1
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#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + 0x7fff0)
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#define CONFIG_SYS_LOAD_ADDR (CONFIG_SYS_SDRAM_BASE + 0x80000)
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#define CONFIG_SYS_BOOTM_LEN SZ_64M
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/* UART */
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/* Generic Timer Definitions */
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#define COUNTER_FREQUENCY 19000000
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/* Fixup - in init code we switch from device to host mode,
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* it has to be done after each HCD reset */
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#define CONFIG_EHCI_HCD_INIT_AFTER_RESET
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/* BOOTP options */
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#define CONFIG_BOOTP_BOOTFILESIZE
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#define BOOT_TARGET_DEVICES(func) \
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func(USB, usb, 0) \
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func(MMC, mmc, 1) \
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func(MMC, mmc, 0) \
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func(DHCP, dhcp, na)
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#include <config_distro_bootcmd.h>
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/* Does what recovery does */
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#define REFLASH(file, part) \
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"part start mmc 0 "#part" start && "\
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"part size mmc 0 "#part" size && "\
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"tftp $loadaddr "#file" && " \
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"mmc write $loadaddr $start $size && "
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#define CONFIG_ENV_REFLASH \
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"mmc dev 0 && "\
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"usb start && "\
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"dhcp && "\
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"tftp $loadaddr dragonboard/rescue/gpt_both0.bin && "\
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"mmc write $loadaddr 0 43 && " \
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"mmc rescan && "\
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REFLASH(dragonboard/rescue/NON-HLOS.bin, 1)\
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REFLASH(dragonboard/rescue/sbl1.mbn, 2)\
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REFLASH(dragonboard/rescue/rpm.mbn, 3)\
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REFLASH(dragonboard/rescue/tz.mbn, 4)\
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REFLASH(dragonboard/rescue/hyp.mbn, 5)\
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REFLASH(dragonboard/rescue/sec.dat, 6)\
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REFLASH(dragonboard/rescue/emmc_appsboot.mbn, 7)\
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REFLASH(dragonboard/u-boot.img, 8)\
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"usb stop &&"\
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"echo Reflash completed"
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/* Environment */
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#define CONFIG_EXTRA_ENV_SETTINGS \
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"reflash="CONFIG_ENV_REFLASH"\0"\
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"loadaddr=0x81000000\0" \
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"initrd_high=0xffffffffffffffff\0" \
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"linux_image=Image\0" \
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"kernel_addr_r=0x81000000\0"\
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"fdtfile=qcom/apq8016-sbc.dtb\0" \
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"fdt_addr_r=0x83000000\0"\
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"ramdisk_addr_r=0x84000000\0"\
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"scriptaddr=0x90000000\0"\
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"pxefile_addr_r=0x90100000\0"\
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BOOTENV
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/* Size of malloc() pool */
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#define CONFIG_SYS_MALLOC_LEN (CONFIG_ENV_SIZE + SZ_8M)
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/* Monitor Command Prompt */
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#define CONFIG_SYS_CBSIZE 512 /* Console I/O Buffer Size */
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#define CONFIG_SYS_MAXARGS 64 /* max command args */
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#endif
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