projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 3d54eabc PT |
1 | /* |
| 2 | * Copyright 2017 Theobroma Systems Design und Consulting GmbH | |
| 3 | * | |
| 4 | * SPDX-License-Identifier: GPL-2.0+ | |
| 5 | */ | |
| 6 | ||
| 7 | /* | |
| 8 | * Execution starts on the instruction following this 4-byte header | |
| cee7470c KY |
9 | * (containing the magic 'RK30', 'RK31', 'RK32' or 'RK33'). This |
| 10 | * magic constant will be written into the final image by the rkimage | |
| 11 | * tool, but we need to reserve space for it here. | |
| 3d54eabc PT |
12 | * |
| 13 | * To make life easier for everyone, we build the SPL binary with | |
| 14 | * space for this 4-byte header already included in the binary. | |
| 15 | */ | |
| 3d54eabc | 16 | #ifdef CONFIG_SPL_BUILD |
| 700f3108 PT |
17 | /* |
| 18 | * We need to add 4 bytes of space for the 'RK33' at the | |
| 19 | * beginning of the executable. However, as we want to keep | |
| 20 | * this generic and make it applicable to builds that are like | |
| 21 | * the RK3368 (TPL needs this, SPL doesn't) or the RK3399 (no | |
| b377d222 PT |
22 | * TPL, but extra space needed in the SPL), we simply insert |
| 23 | * a branch-to-next-instruction-word with the expectation that | |
| 24 | * the first one may be overwritten, if this is the first stage | |
| 25 | * contained in the final image created with mkimage)... | |
| 700f3108 | 26 | */ |
| b377d222 PT |
27 | b 1f /* if overwritten, entry-address is at the next word */ |
| 28 | 1: | |
| 29 | #endif | |
| 30 | #if CONFIG_IS_ENABLED(ROCKCHIP_EARLYRETURN_TO_BROM) | |
| 31 | adr r3, entry_counter | |
| 32 | ldr r0, [r3] | |
| 33 | cmp r0, #1 /* check if entry_counter == 1 */ | |
| 34 | beq reset /* regular bootup */ | |
| 35 | add r0, #1 | |
| 36 | str r0, [r3] /* increment the entry_counter in memory */ | |
| 37 | mov r0, #0 /* return 0 to the BROM to signal 'OK' */ | |
| 38 | bx lr /* return control to the BROM */ | |
| 39 | entry_counter: | |
| 40 | .word 0 | |
| 3d54eabc PT |
41 | #endif |
| 42 | b reset | |
| cee7470c KY |
43 | #if !defined(CONFIG_ARM64) |
| 44 | /* | |
| 45 | * For armv7, the addr '_start' will used as vector start address | |
| 46 | * and write to VBAR register, which needs to aligned to 0x20. | |
| 47 | */ | |
| b377d222 | 48 | .align(5), 0x0 |
| cee7470c KY |
49 | _start: |
| 50 | ARM_VECTORS | |
| 51 | #endif | |
| fa1392a2 KY |
52 | |
| 53 | #if defined(CONFIG_ROCKCHIP_RK3399) && defined(CONFIG_SPL_BUILD) | |
| 54 | .space CONFIG_ROCKCHIP_SPL_RESERVE_IRAM /* space for the ATF data */ | |
| 55 | #endif |