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