u-boot/arch/arm/include/asm/arch-rockchip/boot0.h

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/*
* Copyright 2017 Theobroma Systems Design und Consulting GmbH
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* Execution starts on the instruction following this 4-byte header
* (containing the magic 'RK33').
*
* To make life easier for everyone, we build the SPL binary with
* space for this 4-byte header already included in the binary.
*/
#ifdef CONFIG_SPL_BUILD
.space 0x4 /* space for the 'RK33' */
#endif
b reset
#if defined(CONFIG_ROCKCHIP_RK3399) && defined(CONFIG_SPL_BUILD)
.space CONFIG_ROCKCHIP_SPL_RESERVE_IRAM /* space for the ATF data */
#endif