| Message ID | 1441866030-17231-5-git-send-email-bmeng.cn@gmail.com |
|---|---|
| State | Accepted |
| Delegated to: | Simon Glass |
| Headers | show |
On 10 September 2015 at 00:20, Bin Meng <bmeng.cn@gmail.com> wrote: > When Linux kernel boots, it hangs at: > > [ 0.829408] Intel Quark side-band driver registered > > This happens when Quark kernel Isolated Memory Region (IMR) driver > tries to lock an IMR register to protect kernel's text and rodata > sections. However in order to have IMR function correctly, HMBOUND > register must be locked otherwise the system just hangs. > > Signed-off-by: Bin Meng <bmeng.cn@gmail.com> > Acked-by: Simon Glass <sjg@chromium.org> > --- > > Changes in v2: None > > arch/x86/cpu/quark/quark.c | 3 +++ > arch/x86/include/asm/arch-quark/quark.h | 1 + > 2 files changed, 4 insertions(+) Applied to u-boot-x86, thanks!
diff --git a/arch/x86/cpu/quark/quark.c b/arch/x86/cpu/quark/quark.c index 8d53fe3..3ddf079 100644 --- a/arch/x86/cpu/quark/quark.c +++ b/arch/x86/cpu/quark/quark.c @@ -288,5 +288,8 @@ void board_final_cleanup(void) val &= ~0xff0000; writel(val, &rcba->esd); + /* Lock HMBOUND for security */ + msg_port_setbits(MSG_PORT_HOST_BRIDGE, HM_BOUND, HM_BOUND_LOCK); + return; } diff --git a/arch/x86/include/asm/arch-quark/quark.h b/arch/x86/include/asm/arch-quark/quark.h index eb3afbf..338c896 100644 --- a/arch/x86/include/asm/arch-quark/quark.h +++ b/arch/x86/include/asm/arch-quark/quark.h @@ -32,6 +32,7 @@ /* Host Memory I/O Boundary */ #define HM_BOUND 0x08 +#define HM_BOUND_LOCK 0x00000001 /* Extended Configuration Space */ #define HEC_REG 0x09