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x86: coreboot: Control I/O port 0xb2 writing via device tree

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Writing 0xcb to I/O port 0xb2 (Advanced Power Management Control) causes
U-Boot to hang on QEMU q35 target. We introduce a config option in the
device tree "u-boot,no-apm-finalize" under /config node if we don't want
to do that.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2015-06-03 09:20:05 +08:00 committed by Simon Glass
parent 683b09d783
commit f2653e8dd9
2 changed files with 10 additions and 3 deletions
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10
arch/x86/cpu/coreboot/coreboot.c
View file

@ -7,6 +7,7 @@
*/ */
#include <common.h> #include <common.h>
#include <fdtdec.h>
#include <netdev.h> #include <netdev.h>
#include <asm/io.h> #include <asm/io.h>
#include <asm/msr.h> #include <asm/msr.h>
@ -74,10 +75,15 @@ void board_final_cleanup(void)
mtrr_close(&state); mtrr_close(&state);
} }
/* Issue SMI to Coreboot to lock down ME and registers */ if (!fdtdec_get_config_bool(gd->fdt_blob, "u-boot,no-apm-finalize")) {
printf("Finalizing Coreboot\n"); /*
* Issue SMI to coreboot to lock down ME and registers
* when allowed via device tree
*/
printf("Finalizing coreboot\n");
outb(0xcb, 0xb2); outb(0xcb, 0xb2);
} }
}
int misc_init_r(void) int misc_init_r(void)
{ {

1
arch/x86/dts/qemu-x86_q35.dts
View file

@ -15,6 +15,7 @@
config { config {
silent_console = <0>; silent_console = <0>;
u-boot,no-apm-finalize;
}; };
chosen { chosen {