Recent toolchains default to using the hardware feature for unaligned access on ARM v7, rather than doing the software fallback. According to ARM this is safe as all v7 implementations have to support this feature. (http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0471c/BABJFFA...)
To avoid CPU hangs when doing unaligned memory access, we have to turn off alignment checking in our CPU initialisation code. (http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0491c/CIHCGCF...)
Signed-off-by: Lucas Stach dev@lynxeye.de CC: Albert ARIBAUD albert.u.boot@aribaud.net --- arch/arm/cpu/armv7/start.S | 2 +- 1 Datei geändert, 1 Zeile hinzugefügt(+), 1 Zeile entfernt(-)
diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 261835b..52f7f6e 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -316,7 +316,7 @@ ENTRY(cpu_init_cp15) mrc p15, 0, r0, c1, c0, 0 bic r0, r0, #0x00002000 @ clear bits 13 (--V-) bic r0, r0, #0x00000007 @ clear bits 2:0 (-CAM) - orr r0, r0, #0x00000002 @ set bit 1 (--A-) Align + bic r0, r0, #0x00000002 @ clear bit 1 (--A-) Align orr r0, r0, #0x00000800 @ set bit 11 (Z---) BTB #ifdef CONFIG_SYS_ICACHE_OFF bic r0, r0, #0x00001000 @ clear bit 12 (I) I-cache