| /* |
| * Copyright 2017 NXP |
| * |
| * SPDX-License-Identifier: GPL-2.0+ |
| */ |
| |
| #include <config.h> |
| |
| .align 8 |
| .global rom_pointer |
| rom_pointer: |
| .space 32 |
| |
| /* |
| * Routine: save_boot_params (called after reset from start.S) |
| */ |
| |
| .global save_boot_params |
| save_boot_params: |
| /* The firmware provided ATAG/FDT address can be found in r2/x0 */ |
| adr x0, rom_pointer |
| stp x1, x2, [x0], #16 |
| stp x3, x4, [x0], #16 |
| |
| /* Returns */ |
| /* |
| * We use absolute address not PC relative address for return. |
| * When running SPL on iMX8, the A core starts at address 0, a alias to OCRAM 0x100000, |
| * our linker address for SPL is from 0x100000. So using absolute address can jump to |
| * the OCRAM address from the alias. |
| * The alias only map first 96KB of OCRAM, so this require the SPL size can't beyond 96KB. |
| * But when using SPL DM, the size increase significantly and always beyonds 96KB. |
| * That's why we have to jump to OCRAM. |
| * Normal u-boot also runs into this codes, but there is no impact. |
| */ |
| ldr x1, =save_boot_params_ret |
| br x1 |
| |
| .global restore_boot_params |
| restore_boot_params: |
| adr x0, rom_pointer |
| ldp x1, x2, [x0], #16 |
| ldp x3, x4, [x0], #16 |
| ret |
