mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-13 06:36:16 +09:00
f3a88e2ca1
The ClearFog Base boot from UART when setting the DIP switches to 01001. Unfortunately, the SPL code sometimes fails to detect the UART boot method at run-time. Add an alternative SAR UART boot value to fix this. Note that this alternative value is not documented (Armada 38x Hardware Specifications, Table 48). But experimentations showed it on the ClearFog Base. Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Stefan Roese <sr@denx.de>
126 lines
2.8 KiB
C
126 lines
2.8 KiB
C
/*
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* Copyright (C) 2014-2016 Stefan Roese <sr@denx.de>
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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 <dm.h>
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#include <debug_uart.h>
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#include <fdtdec.h>
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#include <spl.h>
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#include <asm/io.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/soc.h>
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static u32 get_boot_device(void)
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{
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u32 val;
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u32 boot_device;
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/*
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* First check, if UART boot-mode is active. This can only
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* be done, via the bootrom error register. Here the
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* MSB marks if the UART mode is active.
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*/
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val = readl(CONFIG_BOOTROM_ERR_REG);
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boot_device = (val & BOOTROM_ERR_MODE_MASK) >> BOOTROM_ERR_MODE_OFFS;
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debug("BOOTROM_REG=0x%08x boot_device=0x%x\n", val, boot_device);
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if (boot_device == BOOTROM_ERR_MODE_UART)
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return BOOT_DEVICE_UART;
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/*
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* Now check the SAR register for the strapped boot-device
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*/
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val = readl(CONFIG_SAR_REG); /* SAR - Sample At Reset */
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boot_device = (val & BOOT_DEV_SEL_MASK) >> BOOT_DEV_SEL_OFFS;
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debug("SAR_REG=0x%08x boot_device=0x%x\n", val, boot_device);
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switch (boot_device) {
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#ifdef CONFIG_SPL_MMC_SUPPORT
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case BOOT_FROM_MMC:
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case BOOT_FROM_MMC_ALT:
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return BOOT_DEVICE_MMC1;
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#endif
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case BOOT_FROM_UART:
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#ifdef BOOT_FROM_UART_ALT
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case BOOT_FROM_UART_ALT:
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#endif
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return BOOT_DEVICE_UART;
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case BOOT_FROM_SPI:
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default:
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return BOOT_DEVICE_SPI;
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};
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}
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u32 spl_boot_device(void)
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{
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return get_boot_device();
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}
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#ifdef CONFIG_SPL_MMC_SUPPORT
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u32 spl_boot_mode(const u32 boot_device)
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{
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return MMCSD_MODE_RAW;
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}
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#endif
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void board_init_f(ulong dummy)
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{
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int ret;
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/*
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* Pin muxing needs to be done before UART output, since
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* on A38x the UART pins need some re-muxing for output
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* to work.
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*/
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board_early_init_f();
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/* Example code showing how to enable the debug UART on MVEBU */
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#ifdef EARLY_UART
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/*
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* Debug UART can be used from here if required:
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*
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* debug_uart_init();
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* printch('a');
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* printhex8(0x1234);
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* printascii("string");
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*/
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#endif
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ret = spl_init();
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if (ret) {
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debug("spl_init() failed: %d\n", ret);
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hang();
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}
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/* Use special translation offset for SPL */
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dm_set_translation_offset(0xd0000000 - 0xf1000000);
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preloader_console_init();
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timer_init();
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/* Armada 375 does not support SerDes and DDR3 init yet */
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#if !defined(CONFIG_ARMADA_375)
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/* First init the serdes PHY's */
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serdes_phy_config();
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/* Setup DDR */
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ddr3_init();
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#endif
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/*
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* Return to the BootROM to continue the Marvell xmodem
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* UART boot protocol. As initiated by the kwboot tool.
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*
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* This can only be done by the BootROM and not by the
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* U-Boot SPL infrastructure, since the beginning of the
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* image is already read and interpreted by the BootROM.
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* SPL has no chance to receive this information. So we
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* need to return to the BootROM to enable this xmodem
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* UART download.
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*/
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if (get_boot_device() == BOOT_DEVICE_UART)
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return_to_bootrom();
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}
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