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x86: quark: Lock HMBOUND register before jumping to kernel

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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>
This commit is contained in:
Bin Meng 2015-09-09 23:20:26 -07:00 committed by Simon Glass
parent 8e3683029e
commit 693b5f6c71
2 changed files with 4 additions and 0 deletions
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3
arch/x86/cpu/quark/quark.c
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@ -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;
}

1
arch/x86/include/asm/arch-quark/quark.h
View File

@ -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