mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-11 21:56:21 +09:00
bb0c63a5f3
Implement support for saving ARM register R4 early during boot using save_boot_params . Implement support for decoding the stored register R4 value in spl_boot_device() to obtain boot device from which the SoC booted. This way, the SPL will always load U-Boot from the same device from which the SPL itself booted instead of using hard-coded boot device. This functionality is useful for example when booting sama5d2-xplained from SD card, where by default the SPL would try loading the U-Boot from eMMC and fail. This is because eMMC is on SDHCI0 (BOOT_DEVICE_MMC1), while SD slot is on SDHCI1 (BOOT_DEVICE_MMC2) and the SPL was hard-wired to always boot from BOOT_DEVICE_MMC1. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Andreas Bießmann <andreas.devel@googlemail.com> Cc: Wenyou Yang <wenyou.yang@atmel.com> Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/*
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* Copyright (C) 2013 Atmel Corporation
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* Bo Shen <voice.shen@atmel.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/at91_common.h>
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#include <asm/arch/at91_wdt.h>
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#include <asm/arch/clk.h>
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#include <spl.h>
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#if defined(CONFIG_AT91SAM9_WATCHDOG)
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void at91_disable_wdt(void) { }
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#else
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void at91_disable_wdt(void)
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{
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struct at91_wdt *wdt = (struct at91_wdt *)ATMEL_BASE_WDT;
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writel(AT91_WDT_MR_WDDIS, &wdt->mr);
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}
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#endif
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#if defined(CONFIG_SAMA5D2)
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struct {
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u32 r4;
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} bootrom_stash __attribute__((section(".data")));
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u32 spl_boot_device(void)
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{
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u32 dev = (bootrom_stash.r4 >> ATMEL_SAMA5D2_BOOT_FROM_OFF) &
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ATMEL_SAMA5D2_BOOT_FROM_MASK;
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u32 off = (bootrom_stash.r4 >> ATMEL_SAMA5D2_BOOT_DEV_ID_OFF) &
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ATMEL_SAMA5D2_BOOT_DEV_ID_MASK;
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#if defined(CONFIG_SYS_USE_MMC)
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if (dev == ATMEL_SAMA5D2_BOOT_FROM_MCI) {
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if (off == 0)
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return BOOT_DEVICE_MMC1;
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if (off == 1)
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return BOOT_DEVICE_MMC2;
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printf("ERROR: MMC controller %i not present!\n", dev);
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hang();
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}
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#endif
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#if defined(CONFIG_SYS_USE_SERIALFLASH) || defined(CONFIG_SYS_USE_SPIFLASH)
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if (dev == ATMEL_SAMA5D2_BOOT_FROM_SPI)
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return BOOT_DEVICE_SPI;
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#endif
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printf("ERROR: SMC/TWI/QSPI boot device not supported!\n"
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" Boot device %i, controller number %i\n", dev, off);
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return BOOT_DEVICE_NONE;
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}
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#else
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u32 spl_boot_device(void)
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{
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#ifdef CONFIG_SYS_USE_MMC
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return BOOT_DEVICE_MMC1;
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#elif CONFIG_SYS_USE_NANDFLASH
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return BOOT_DEVICE_NAND;
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#elif CONFIG_SYS_USE_SERIALFLASH || CONFIG_SYS_USE_SPIFLASH
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return BOOT_DEVICE_SPI;
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#endif
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return BOOT_DEVICE_NONE;
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}
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#endif
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u32 spl_boot_mode(void)
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{
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switch (spl_boot_device()) {
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#ifdef CONFIG_SYS_USE_MMC
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case BOOT_DEVICE_MMC1:
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case BOOT_DEVICE_MMC2:
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return MMCSD_MODE_FS;
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break;
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#endif
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case BOOT_DEVICE_NONE:
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default:
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hang();
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}
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}
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