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