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 <mmc.h> 8#include <spl.h> 9 10u32 spl_mmc_boot_mode(struct mmc *mmc, const u32 boot_device) 11{ 12 /* 13 * work around a bug in the Boot ROM of LD4, Pro4, and sLD8: 14 * 15 * The boot ROM in these SoCs breaks the PARTITION_CONFIG [179] of 16 * Extended CSD register; when switching to the Boot Partition 1, the 17 * Boot ROM should issue the SWITCH command (CMD6) with Set Bits for 18 * the Access Bits, but in fact it uses Write Byte for the Access Bits. 19 * As a result, the BOOT_PARTITION_ENABLE field of the PARTITION_CONFIG 20 * is lost. This bug was fixed for PH1-Pro5 and later SoCs. 21 * 22 * Fixup mmc->part_config here because it is used to determine the 23 * partition which the U-Boot image is read from. 24 */ 25 mmc->part_config &= ~EXT_CSD_BOOT_PART_NUM(PART_ACCESS_MASK); 26 mmc->part_config |= EXT_CSD_BOOT_PARTITION_ENABLE; 27 28 return MMCSD_MODE_EMMCBOOT; 29} 30