| /* 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 |
