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https://github.com/smaeul/u-boot.git
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eb3967388e
Add iMX8M specific armv8_el2_to_aarch32 to let AArch64 mode U-Boot
could boot aarch32 mode linux with FIT image as below:
/dts-v1/;
/ {
description = "Configuration to load ARM32 Linux";
images {
kernel@1 {
description = "ARM32 Linux kernel";
data = /incbin/("./Image");
type = "kernel";
arch = "arm";
os = "linux";
compression = "none";
load = <0x40008000>;
entry = <0x40008000>;
hash@1 {
algo = "md5";
};
};
fdt@1 {
description = "Flattened Device Tree blob";
data = /incbin/("./imx8mm-evk.dtb");
type = "flat_dt";
arch = "arm";
compression = "none";
load = <0x43000000>;
hash@1 {
algo = "md5";
};
};
};
configurations {
default = "config@1";
config@1 {
description = "fsl-imx8mm-evk";
kernel = "kernel@1";
fdt = "fdt@1";
};
};
};
Signed-off-by: Peng Fan <peng.fan@nxp.com>
75 lines
1.4 KiB
ArmAsm
75 lines
1.4 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2017 NXP
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*/
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#include <config.h>
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.align 8
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.global rom_pointer
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rom_pointer:
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.space 256
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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, rom_pointer
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stp x1, x2, [x0], #16
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stp x3, x4, [x0], #16
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stp x5, x6, [x0], #16
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stp x7, x8, [x0], #16
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stp x9, x10, [x0], #16
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stp x11, x12, [x0], #16
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stp x13, x14, [x0], #16
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stp x15, x16, [x0], #16
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stp x17, x18, [x0], #16
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stp x19, x20, [x0], #16
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stp x21, x22, [x0], #16
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stp x23, x24, [x0], #16
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stp x25, x26, [x0], #16
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stp x27, x28, [x0], #16
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stp x29, x30, [x0], #16
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mov x30, sp
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str x30, [x0], #8
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/* Returns */
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b save_boot_params_ret
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.global restore_boot_params
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restore_boot_params:
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adr x0, rom_pointer
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ldp x1, x2, [x0], #16
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ldp x3, x4, [x0], #16
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ldp x5, x6, [x0], #16
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ldp x7, x8, [x0], #16
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ldp x9, x10, [x0], #16
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ldp x11, x12, [x0], #16
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ldp x13, x14, [x0], #16
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ldp x15, x16, [x0], #16
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ldp x17, x18, [x0], #16
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ldp x19, x20, [x0], #16
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ldp x21, x22, [x0], #16
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ldp x23, x24, [x0], #16
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ldp x25, x26, [x0], #16
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ldp x27, x28, [x0], #16
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ldp x29, x30, [x0], #16
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ldr x0, [x0]
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mov sp, x0
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ret
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.global armv8_el2_to_aarch32
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armv8_el2_to_aarch32:
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cmp x0, #0
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bne 0f
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mov x3, x2
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mov x2, x1
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mov x1, x4
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ldr x0, =0xc20000fd
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0:
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smc #0
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ret
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