Dear all: I try to modify the content of ehci registers directly by mmap, but I have some trouble about it. I see the driver use writel to change the whole register rather than byte by byte. So I cast the return type of mmap as unsigned long*, but the content will be got wrong by using this pointer and not even mention to change the value by it. I attach 2 versions of my get-memory, memget and memget_dword, and memget seems output the right value in ehci registers. I also attach the printing result for your reference. BTW, does there already exist some callback function in usb-driver which can let me change the register directly or someone knows where I can get such tool from net? Thanks for your help, vichy
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memget.c
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[root@Linux LinUtil.old]# ./memget_dword ec103000 0 40 Map 0X1000000 bytes at offset 0X0 from "/dev/mem" to 0XB6F5D000 EC103000:00000000 : 01000020 EC103000:00000004 : 00000000 EC103000:00000008 : 00010001 EC103000:0000000C : 00000000 EC103000:00000010 : 00000000 EC103000:00000014 : 00000000 EC103000:00000018 : 00000000 EC103000:0000001C : 00003000 EC103000:00000020 : 00013002 EC103000:00000024 : 00000000 EC103000:00000028 : 00000000 EC103000:0000002C : 00000000 EC103000:00000030 : 00000000 EC103000:00000034 : 00000000 EC103000:00000038 : 00000000 EC103000:0000003C : 00000000 [root@Linux LinUtil.old]# ./memget ec103000 0 40 Map 0X40 bytes at offset 0X00000000 from "/dev/mem" to 0XB6F74000 EC103000:00000000 : 01000020 EC103000:00000004 : 00103308 EC103000:00000008 : 00007070 EC103000:0000000C : 00000000 EC103000:00000010 : 00000000 EC103000:00000014 : 00000000 EC103000:00000018 : 00000000 EC103000:0000001C : 00000000 EC103000:00000020 : 00010001 EC103000:00000024 : 0000000C EC103000:00000028 : 00000000 EC103000:0000002C : 000028E5 EC103000:00000030 : 00000000 EC103000:00000034 : 1C3A3000 EC103000:00000038 : 111D7000 EC103000:0000003C : 00000000 [root@Linux LinUtil.old]#
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memget_dword.c
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