By default the legacy segments (A0000h-B0000h, E0000h-F0000h) do not decode to system RAM. Turn on the decode so that we can write configuration tables in the F segment.

Signed-off-by: Bin Meng bmeng.cn@gmail.com ---

arch/x86/cpu/quark/quark.c | 12 ++++++++++++ arch/x86/include/asm/arch-quark/quark.h | 7 +++++++ 2 files changed, 19 insertions(+)

diff --git a/arch/x86/cpu/quark/quark.c b/arch/x86/cpu/quark/quark.c index e4b19c2..4ffa437 100644 --- a/arch/x86/cpu/quark/quark.c +++ b/arch/x86/cpu/quark/quark.c @@ -72,6 +72,15 @@ static void quark_setup_bars(void) CONFIG_PCIE_ECAM_BASE | MEM_BAR_EN); }

+static void quark_enable_legacy_seg(void) +{ + u32 hmisc2; + + hmisc2 = msg_port_read(MSG_PORT_HOST_BRIDGE, HMISC2); + hmisc2 |= (HMISC2_SEGE | HMISC2_SEGF | HMISC2_SEGAB); + msg_port_write(MSG_PORT_HOST_BRIDGE, HMISC2, hmisc2); +} + int arch_cpu_init(void) { struct pci_controller *hose; @@ -96,6 +105,9 @@ int arch_cpu_init(void) */ quark_setup_bars();

+ /* Turn on legacy segments (A/B/E/F) decode to system RAM */ + quark_enable_legacy_seg(); + unprotect_spi_flash();

return 0; diff --git a/arch/x86/include/asm/arch-quark/quark.h b/arch/x86/include/asm/arch-quark/quark.h index ceb583e..6dd02fd 100644 --- a/arch/x86/include/asm/arch-quark/quark.h +++ b/arch/x86/include/asm/arch-quark/quark.h @@ -21,6 +21,13 @@

/* Port 0x03: Host Bridge Message Port Registers */

+/* Host Miscellaneous Controls 2 */ +#define HMISC2 0x03 + +#define HMISC2_SEGE 0x00000002 +#define HMISC2_SEGF 0x00000004 +#define HMISC2_SEGAB 0x00000010 + /* Host Memory I/O Boundary */ #define HM_BOUND 0x08