LXR uboot/arch/arm/mach-uniphier/mmc-boot-mode.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (C) 2016 Socionext Inc.
   4 *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
   5 */
   6
   7#include <common.h>
   8#include <mmc.h>
   9#include <spl.h>
  10
  11u32 spl_boot_mode(const u32 boot_device)
  12{
  13        struct mmc *mmc;
  14
  15        /*
  16         * work around a bug in the Boot ROM of LD4, Pro4, and sLD8:
  17         *
  18         * The boot ROM in these SoCs breaks the PARTITION_CONFIG [179] of
  19         * Extended CSD register; when switching to the Boot Partition 1, the
  20         * Boot ROM should issue the SWITCH command (CMD6) with Set Bits for
  21         * the Access Bits, but in fact it uses Write Byte for the Access Bits.
  22         * As a result, the BOOT_PARTITION_ENABLE field of the PARTITION_CONFIG
  23         * is lost.  This bug was fixed for PH1-Pro5 and later SoCs.
  24         *
  25         * Fixup mmc->part_config here because it is used to determine the
  26         * partition which the U-Boot image is read from.
  27         */
  28        mmc = find_mmc_device(0);
  29        mmc->part_config &= ~EXT_CSD_BOOT_PART_NUM(PART_ACCESS_MASK);
  30        mmc->part_config |= EXT_CSD_BOOT_PARTITION_ENABLE;
  31
  32        return MMCSD_MODE_EMMCBOOT;
  33}
  34