60 lines
2.0 KiB
C
60 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2017 Theobroma Systems Design und Consulting GmbH
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*/
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/*
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* Execution starts on the instruction following this 4-byte header
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* (containing the magic 'RK30', 'RK31', 'RK32' or 'RK33'). This
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* magic constant will be written into the final image by the rkimage
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* tool, but we need to reserve space for it here.
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*
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* To make life easier for everyone, we build the SPL binary with
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* space for this 4-byte header already included in the binary.
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*/
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#ifdef CONFIG_SPL_BUILD
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/*
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* We need to add 4 bytes of space for the 'RK33' at the
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* beginning of the executable. However, as we want to keep
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* this generic and make it applicable to builds that are like
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* the RK3368 (TPL needs this, SPL doesn't) or the RK3399 (no
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* TPL, but extra space needed in the SPL), we simply insert
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* a branch-to-next-instruction-word with the expectation that
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* the first one may be overwritten, if this is the first stage
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* contained in the final image created with mkimage)...
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*/
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b 1f /* if overwritten, entry-address is at the next word */
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1:
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#endif
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#if CONFIG_IS_ENABLED(ROCKCHIP_EARLYRETURN_TO_BROM)
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adr r3, entry_counter
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ldr r0, [r3]
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cmp r0, #1 /* check if entry_counter == 1 */
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beq reset /* regular bootup */
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add r0, #1
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str r0, [r3] /* increment the entry_counter in memory */
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mov r0, #0 /* return 0 to the BROM to signal 'OK' */
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bx lr /* return control to the BROM */
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entry_counter:
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.word 0
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#endif
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#if (defined(CONFIG_SPL_BUILD) || defined(CONFIG_ARM64))
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/* U-Boot proper of armv7 do not need this */
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b reset
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#endif
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#if !defined(CONFIG_ARM64)
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/*
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* For armv7, the addr '_start' will used as vector start address
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* and write to VBAR register, which needs to aligned to 0x20.
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*/
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.align(5), 0x0
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_start:
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ARM_VECTORS
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#endif
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#if defined(CONFIG_SPL_BUILD) && (CONFIG_ROCKCHIP_SPL_RESERVE_IRAM > 0)
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.space CONFIG_ROCKCHIP_SPL_RESERVE_IRAM /* space for the ATF data */
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#endif
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