28335 gpio寄存器无法用汇编写入问题-TI中文支持网

打算用汇编初始化 XINTF

原来用的C代码功能已经实现

EALLOW;
*(unsigned long *)0x0B20 = 0x0043FFFF; /* Zone0 */
*(unsigned long *)0x0B2C = 0x0043FFFF; /* Zone6 */
*(unsigned long *)0x0B2E = 0x0043FFFF; /* Zone7 */

*(unsigned long *)0X0B34 = 0X00010D14;
*(unsigned long *)0X0B38 = 0X0000003F;
*(unsigned long *)0X0B3A = 0X00000005;

*(unsigned long volatile *)0x6F96 = 0xFFFFFFF5; /* GPBMUX1 */
*(unsigned long volatile *)0x6f88 = 0xFF000000; /* GPAMUX2 */
*(unsigned long volatile *)0x6FA8 = 0x0000AAAA; /* GPCMUX2 */
*(unsigned long volatile *)0x6FA6 = 0xAAAAAAAA; /* GPCMUX1 */
EDIS;

汇编代码是从 Disassembly copy过来的，

EALLOW
MOV @AL, #0xffff
MOVB AH, #0x43
MOVL XAR4, #0x000b20
MOVL *+XAR4[0], ACC

MOVL XAR4, #0x000b2c
MOVL *+XAR4[0], ACC

MOVL XAR4, #0x000b2e
MOVL *+XAR4[0], ACC

MOVL XAR5, #0x010d14
MOVL XAR4, #0x000b34
MOVL *+XAR4[0], XAR5

MOVL XAR4, #0x000b38
MOVB ACC, #63
MOVL *+XAR4[0], ACC

MOVL XAR4, #0x000b3a
MOVB ACC, #5
MOVL *+XAR4[0], ACC

MOVL XAR4, #0x006f96
MOVB ACC, #0
SUBB ACC, #11
MOVL *+XAR4[0], ACC

SETC SXM
MOVL XAR4, #0x006f88
MOV ACC, #0xfe00 << 15
MOVL *+XAR4[0], ACC

MOVL XAR4, #0x006fa8
MOVL XAR5, #0x00aaaa
MOVL *+XAR4[0], XAR5

MOV @AL, #0xaaaa
MOV @AH, #0xaaaa
MOVL XAR4, #0x006fa6
MOVL *+XAR4[0], ACC

EDIS

发现后面4句，也就是有volatile 修饰的GPIO寄存器无法写入，请各位大神帮忙分析一下

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