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Masahiro Yamada81c847b2017-02-14 01:24:25 +09001/*
2 * Copyright (C) 2016 Socionext Inc.
3 * Author: Masahiro Yamada <yamada.masahiro@socionext.com>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
9#include <mmc.h>
10#include <spl.h>
11
12u32 spl_boot_mode(const u32 boot_device)
13{
14 struct mmc *mmc;
15
16 /*
Masahiro Yamada00aa4532017-08-13 09:01:13 +090017 * work around a bug in the Boot ROM of LD4, Pro4, and sLD8:
Masahiro Yamada81c847b2017-02-14 01:24:25 +090018 *
19 * The boot ROM in these SoCs breaks the PARTITION_CONFIG [179] of
20 * Extended CSD register; when switching to the Boot Partition 1, the
21 * Boot ROM should issue the SWITCH command (CMD6) with Set Bits for
22 * the Access Bits, but in fact it uses Write Byte for the Access Bits.
23 * As a result, the BOOT_PARTITION_ENABLE field of the PARTITION_CONFIG
24 * is lost. This bug was fixed for PH1-Pro5 and later SoCs.
25 *
26 * Fixup mmc->part_config here because it is used to determine the
27 * partition which the U-Boot image is read from.
28 */
29 mmc = find_mmc_device(0);
30 mmc->part_config &= ~EXT_CSD_BOOT_PART_NUM(PART_ACCESS_MASK);
31 mmc->part_config |= EXT_CSD_BOOT_PARTITION_ENABLE;
32
33 return MMCSD_MODE_EMMCBOOT;
34}