Hi, To perform a Memory Mapped access of a device, I setup the OR and BR registers in the bootloader (u-boot). I am able to read and write to the device being in the u-boot prompt. However, when I try to access the device after the Linux kernel boots up (say, in a driver), it gives me a exception message as follows. ################################################################# enabl0004, DSISR: 00000063 TASK = c3ef4000[18] 'insmod' Last syscall: 128 last math 00000000 last altivec 00000000 GPR00: C60B0338 C3EF5E50 C3EF4000 60000004 00001032 00000001 C018009E C60B0000 GPR08: C60B0BB8 C60B085C C60B0BBC C60B0000 C0180000 10056374 00000000 00000000 3 TASK = c3ef4000[18] 'insmod' Last syscall: 128 last math 00000000 last altivec 00000000 GPR00: C60B0338 C3EF5E50 C3EF4000 60000004 00001032 00000001 C018009E C60B0000 GPR08: C60B0BB8 C60B085C C60B0BBC C60B0000 C0180000 10056374 00000000 00000000 GPR16: 00000000 00000000 00000000 00000000 00009032 C3EF5E98 10064EBC C3E2C000 GPR24: C02EEA80 00000008 C60B2000 00000060 FFFFFFEA 00000000 C60B0000 C60B0000 Call backtrace: 00000000 C60B0338 C0014DE4 C000447C 10050000 1000B27C 1000C344 10003CBC 100038C8 0FE70E88 00000000 #################################################################
My platform is MPC880 Processor. Do I need to setup something more in the kernel? -- Rupesh S
