181c847bfSMasahiro Yamada /* 281c847bfSMasahiro Yamada * Copyright (C) 2016 Socionext Inc. 381c847bfSMasahiro Yamada * Author: Masahiro Yamada <yamada.masahiro@socionext.com> 481c847bfSMasahiro Yamada * 581c847bfSMasahiro Yamada * SPDX-License-Identifier: GPL-2.0+ 681c847bfSMasahiro Yamada */ 781c847bfSMasahiro Yamada 881c847bfSMasahiro Yamada #include <common.h> 981c847bfSMasahiro Yamada #include <mmc.h> 1081c847bfSMasahiro Yamada #include <spl.h> 1181c847bfSMasahiro Yamada 1281c847bfSMasahiro Yamada u32 spl_boot_mode(const u32 boot_device) 1381c847bfSMasahiro Yamada { 1481c847bfSMasahiro Yamada struct mmc *mmc; 1581c847bfSMasahiro Yamada 1681c847bfSMasahiro Yamada /* 17*00aa453eSMasahiro Yamada * work around a bug in the Boot ROM of LD4, Pro4, and sLD8: 1881c847bfSMasahiro Yamada * 1981c847bfSMasahiro Yamada * The boot ROM in these SoCs breaks the PARTITION_CONFIG [179] of 2081c847bfSMasahiro Yamada * Extended CSD register; when switching to the Boot Partition 1, the 2181c847bfSMasahiro Yamada * Boot ROM should issue the SWITCH command (CMD6) with Set Bits for 2281c847bfSMasahiro Yamada * the Access Bits, but in fact it uses Write Byte for the Access Bits. 2381c847bfSMasahiro Yamada * As a result, the BOOT_PARTITION_ENABLE field of the PARTITION_CONFIG 2481c847bfSMasahiro Yamada * is lost. This bug was fixed for PH1-Pro5 and later SoCs. 2581c847bfSMasahiro Yamada * 2681c847bfSMasahiro Yamada * Fixup mmc->part_config here because it is used to determine the 2781c847bfSMasahiro Yamada * partition which the U-Boot image is read from. 2881c847bfSMasahiro Yamada */ 2981c847bfSMasahiro Yamada mmc = find_mmc_device(0); 3081c847bfSMasahiro Yamada mmc->part_config &= ~EXT_CSD_BOOT_PART_NUM(PART_ACCESS_MASK); 3181c847bfSMasahiro Yamada mmc->part_config |= EXT_CSD_BOOT_PARTITION_ENABLE; 3281c847bfSMasahiro Yamada 3381c847bfSMasahiro Yamada return MMCSD_MODE_EMMCBOOT; 3481c847bfSMasahiro Yamada } 35