u-boot/arch/arm/mach-imx/imx8/lowlevel_init.S
Peng Fan fefe051335 imx8: save args passed from ATF
We use information from ATF to know whether OP-TEE is running or not.
So save args passed from ATF.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
2019-10-08 16:35:59 +02:00

36 lines
1,014 B
ArmAsm

/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright 2019 NXP
*/
#include <config.h>
.align 8
.global boot_pointer
boot_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, boot_pointer
stp x1, x2, [x0], #16
stp x3, x4, [x0], #16
/*
* We use absolute address not PC relative address for return.
* When running SPL on iMX8, the A core starts at address 0,
* an 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