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@denx.de Signed-off-by: Bin Meng bmeng.cn@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;