37 lines
1014 B
ArmAsm
37 lines
1014 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2019 NXP
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*/
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#include <config.h>
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.align 8
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.global boot_pointer
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boot_pointer:
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.space 32
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/*
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* Routine: save_boot_params (called after reset from start.S)
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*/
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.global save_boot_params
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save_boot_params:
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/* The firmware provided ATAG/FDT address can be found in r2/x0 */
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adr x0, boot_pointer
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stp x1, x2, [x0], #16
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stp x3, x4, [x0], #16
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/*
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* We use absolute address not PC relative address for return.
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* When running SPL on iMX8, the A core starts at address 0,
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* an alias to OCRAM 0x100000, our linker address for SPL is
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* from 0x100000. So using absolute address can jump to the OCRAM
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* address from the alias. The alias only map first 96KB of OCRAM,
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* so this require the SPL size can't beyond 96KB.
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* But when using SPL DM, the size increase significantly and
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* always beyonds 96KB. That's why we have to jump to OCRAM.
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* Normal u-boot also runs into this codes, but there is no impact.
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*/
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ldr x1, =save_boot_params_ret
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br x1
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