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arm, arm926ejs: Add option CONFIG_SYS_EXCEPTION_VECTORS_HIGH

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The V bit of the c1 register of CP15 should not be cleared on DA850
SoCs since they have no valid memory at 0x00000000. This patch
introduces a configuration option CONFIG_SYS_EXCEPTION_VECTORS_HIGH
that allows setting the correct value for the V bit.

Signed-off-by: Christian Riesch <christian.riesch@omicron.at>
Reported-by: Sughosh Ganu <urwithsughosh@gmail.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Tom Rini <trini@ti.com>
Cc: Sughosh Ganu <urwithsughosh@gmail.com>
Cc: Heiko Schocher <hs@denx.de>
This commit is contained in:
Christian Riesch 2012-02-02 00:44:39 +00:00 committed by Albert ARIBAUD
parent da104e04ec
commit b67d8816fd
5 changed files with 15 additions and 1 deletions
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6
README
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@ -420,6 +420,12 @@ The following options need to be configured:
XWAY SoCs for booting from NOR flash. The U-Boot image needs to
be swapped if a flash programmer is used.
- ARM options:
CONFIG_SYS_EXCEPTION_VECTORS_HIGH
Select high exception vectors of the ARM core, e.g., do not
clear the V bit of the c1 register of CP15.
- Linux Kernel Interface:
CONFIG_CLOCKS_IN_MHZ

7
arch/arm/cpu/arm926ejs/start.S
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@ -372,8 +372,13 @@ flush_dcache:
* disable MMU and D cache, and enable I cache
*/
mrc p15, 0, r0, c1, c0, 0
bic r0, r0, #0x00002300 /* clear bits 13, 9:8 (--V- --RS) */
bic r0, r0, #0x00000300 /* clear bits 9:8 (---- --RS) */
bic r0, r0, #0x00000087 /* clear bits 7, 2:0 (B--- -CAM) */
#ifdef CONFIG_SYS_EXCEPTION_VECTORS_HIGH
orr r0, r0, #0x00002000 /* set bit 13 (--V- ----) */
#else
bic r0, r0, #0x00002000 /* clear bit 13 (--V- ----) */
#endif
orr r0, r0, #0x00000002 /* set bit 2 (A) Align */
orr r0, r0, #0x00001000 /* set bit 12 (I) I-Cache */
mcr p15, 0, r0, c1, c0, 0

1
include/configs/da850evm.h
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@ -37,6 +37,7 @@
#define CONFIG_ARM926EJS /* arm926ejs CPU core */
#define CONFIG_SOC_DA8XX /* TI DA8xx SoC */
#define CONFIG_SOC_DA850 /* TI DA850 SoC */
#define CONFIG_SYS_EXCEPTION_VECTORS_HIGH
#define CONFIG_SYS_CLK_FREQ clk_get(DAVINCI_ARM_CLKID)
#define CONFIG_SYS_OSCIN_FREQ 24000000
#define CONFIG_SYS_TIMERBASE DAVINCI_TIMER0_BASE

1
include/configs/enbw_cmc.h
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@ -40,6 +40,7 @@
#define CONFIG_ARM926EJS /* arm926ejs CPU core */
#define CONFIG_SOC_DA8XX /* TI DA8xx SoC */
#define CONFIG_SOC_DA850 /* TI DA850 SoC */
#define CONFIG_SYS_EXCEPTION_VECTORS_HIGH
#define CONFIG_SYS_CLK_FREQ clk_get(DAVINCI_ARM_CLKID)
#define CONFIG_SYS_OSCIN_FREQ 24000000
#define CONFIG_SYS_TIMERBASE DAVINCI_TIMER0_BASE

1
include/configs/hawkboard.h
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@ -35,6 +35,7 @@
#define CONFIG_ARM926EJS /* arm926ejs CPU core */
#define CONFIG_SOC_DA8XX /* TI DA8xx SoC */
#define CONFIG_SOC_DA850 /* TI DA850 SoC */
#define CONFIG_SYS_EXCEPTION_VECTORS_HIGH
#define CONFIG_SYS_CLK_FREQ clk_get(DAVINCI_ARM_CLKID)
#define CONFIG_SYS_OSCIN_FREQ 24000000
#define CONFIG_SYS_TIMERBASE DAVINCI_TIMER0_BASE