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https://github.com/brain-hackers/u-boot-brain
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![Chris Packham](/assets/img/avatar_default.png)
The bootROM in the Armada-38x (and similar) SoC has two modes for UART boot. The first is when the normal boot media is blank (or otherwise missing the kwb header). The second is when the boot sequence has been interrupted with the magic byte sequence on the UART lines. In the first mode the bootROM routine and error code register will indicate that there was an error booting from the configured media in bits 7:0. In the second mode there is no error to indicate but the boot source is provided via bits 31:28. Handle both situations so that kwboot can be used for both boot strapping a blank board and for intercepting a regular boot sequence. Signed-off-by: Chris Packham <judge.packham@gmail.com> Signed-off-by: Sean Nyekjaer <sean.nyekjaer@prevas.dk> Signed-off-by: Stefan Roese <sr@denx.de>
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2014-2016 Stefan Roese <sr@denx.de>
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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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#ifdef CONFIG_ARMADA_38X
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/*
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* If the bootrom error code contains any other than zeros it's an
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* error condition and the bootROM has fallen back to UART boot
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*/
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boot_device = (val & BOOTROM_ERR_CODE_MASK) >> BOOTROM_ERR_CODE_OFFS;
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if (boot_device)
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return BOOT_DEVICE_UART;
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#endif
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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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#if defined(CONFIG_ARMADA_38X)
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case BOOT_FROM_NAND:
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return BOOT_DEVICE_NAND;
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#endif
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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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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 booting from NAND lets let the BootROM load the
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* rest of the bootloader.
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*/
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switch (get_boot_device()) {
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case BOOT_DEVICE_UART:
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#if defined(CONFIG_ARMADA_38X)
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case BOOT_DEVICE_NAND:
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#endif
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return_to_bootrom();
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}
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}
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