From: Peng Fan peng.fan@nxp.com
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 --- arch/arm/mach-imx/imx8m/lowlevel_init.S | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/arch/arm/mach-imx/imx8m/lowlevel_init.S b/arch/arm/mach-imx/imx8m/lowlevel_init.S index a4c6466ca9..a49a9cdb35 100644 --- a/arch/arm/mach-imx/imx8m/lowlevel_init.S +++ b/arch/arm/mach-imx/imx8m/lowlevel_init.S @@ -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