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