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imx8m: implement armv8_el2_to_aarch32

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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>
This commit is contained in:
Peng Fan 2020-07-10 11:22:20 +08:00
parent 3c41728d80
commit eb3967388e
1 changed files with 12 additions and 0 deletions
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12
arch/arm/mach-imx/imx8m/lowlevel_init.S
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@ -60,3 +60,15 @@ restore_boot_params:
ldr x0, [x0]
mov sp, x0
ret
.global armv8_el2_to_aarch32
armv8_el2_to_aarch32:
cmp x0, #0
bne 0f
mov x3, x2
mov x2, x1
mov x1, x4
ldr x0, =0xc20000fd
0:
smc #0
ret