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