| 标题 | 阅读 | 评论 | 转发 | 发布日期 | |
|---|---|---|---|---|---|
| MACHINE_START宏 | 545 | 0 | 0 | 2010-05-19 | |
| 下半部和推后执行的工作 | 503 | 0 | 0 | 2010-05-06 | |
| 中断和中断处理程序 | 1490 | 0 | 0 | 2010-05-05 | |
| socketpair | 792 | 0 | 1 | 2010-04-30 | |
| atexit | 855 | 0 | 0 | 2010-04-30 | |
| 主次设备号 | 563 | 0 | 0 | 2010-04-29 | |
| umask | 746 | 0 | 0 | 2010-04-28 | |
| open read write create lseek | 648 | 0 | 0 | 2010-04-28 | |
| 用UtraISO制作光盘镜像 | 800 | 0 | 0 | 2010-04-26 | |
| select | 1752 | 0 | 5 | 2010-04-11 | |
| chmod | 1740 | 0 | 0 | 2010-03-26 | |
| python unicode | 1407 | 0 | 0 | 2010-03-24 | |
| python 字符串操作 | 676 | 0 | 0 | 2010-03-22 | |
| uart | 1054 | 0 | 0 | 2010-02-21 | |
| fcntl | 661 | 0 | 0 | 2010-02-21 | |
| find | 493 | 0 | 0 | 2010-02-05 | |
| 进程调度 | 765 | 0 | 0 | 2010-01-29 | |
| 从内核出发 | 649 | 0 | 0 | 2010-01-26 | |
| __builtin_constant_p | 763 | 0 | 0 | 2010-01-08 |
config20102009-11-19 20:15
外设fpga做的8k的memory，用arm9去读写它，在linux2.6系统下；这样做对吗？
实际地址映射到虚拟内存中，用得到的虚拟地址去读写。
地址总线：a1-a14 数据总线：d0-d15
#define FPGA_BASE_ADDR (0x18000000)//片选为nGCS3
#define BWSCON (0x48000000)
#define BANKCON3 (0x48000010)
#define IP_SIZE (0x1FFF)//13根地址线8K的物理空间
static void *bwscon,*bankcon3,*fpga_base_addr;
bwscon = ioremap_nocache(BWSCON,0x0000004);
bankcon3 = ioremap_nocache(BANKCON3,0x0000004);
fpga_base_addr = ioremap_nocache(FPGA_BASE_ADDR,IP_SIZE);
writel(readl(bwscon)|0xD000,bwscon);
writel(0x7FFC,bankcon3);
for(i=0;i
