[U-Boot] [PATCH] x86: baytrail: acpi: Add full reset bit to the reset register value in FADT

Bin Meng bmeng.cn at gmail.com
Tue Aug 29 05:09:11 UTC 2017

It was noticed a few times, that the reboot from Linux (reboot command)
is different from the reboot (reset command) under U-Boot. The U-Boot
version does seem to reset the board more deeply (PCI cards etc) than
the Linux reboot.

This is actually caused by missing full reset bit in the reset register
value in the ACPI FADT table.

Reported-by: Stefan Roese <sr at denx.de>
Signed-off-by: Bin Meng <bmeng.cn at gmail.com>

 arch/x86/cpu/baytrail/acpi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/cpu/baytrail/acpi.c b/arch/x86/cpu/baytrail/acpi.c
index cbefdf8..7aac634 100644
--- a/arch/x86/cpu/baytrail/acpi.c
+++ b/arch/x86/cpu/baytrail/acpi.c
@@ -73,7 +73,7 @@ void acpi_create_fadt(struct acpi_fadt *fadt, struct acpi_facs *facs,
 	fadt->reset_reg.access_size = ACPI_ACCESS_SIZE_BYTE_ACCESS;
 	fadt->reset_reg.addrl = IO_PORT_RESET;
 	fadt->reset_reg.addrh = 0;
-	fadt->reset_value = SYS_RST | RST_CPU;
+	fadt->reset_value = SYS_RST | RST_CPU | FULL_RST;
 	fadt->x_firmware_ctl_l = (u32)facs;
 	fadt->x_firmware_ctl_h = 0;

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