> -----Original Message----- > From: owner-linuxppc-embedded at lists.linuxppc.org > [mailto:owner-linuxppc-embedded at lists.linuxppc.org]On Behalf Of > Arunachalam, Saravanan > Sent: Tuesday, June 01, 2004 1:57 PM > To: linuxppc-embedded at lists.linuxppc.org > Subject: Reset for MPC8245 > > > > Hi, > > I am trying to do Internal Hard Reset from the kernel for > MPC8245 based > custom board. I tried the Machine check stop approach but it doesn't > work. I am able to successfully do from the u-boot bootloader. The > following code generates Instruction Exception at the instruction that > turns off MMU. > > msr = mfmsr(); > > /* Interrupts and MMU off */ > __asm__ __volatile__ ("mfmsr %0":"=r" (msr)); > > msr &= ~0x1030; > __asm__ __volatile__ ("mtmsr %0"::"r" (msr)); <--- > Instruction Except > addr = 0xfff00100; > ((void (*)(void)) addr) (); > > If anyone has a solution to this, I would greatly appreciate it. > > Thanks > Arun
I don't know if it is a solution, but I'm suspicious of the line " addr = 0xfff00100;". The key to doing a machine check reset is (a) reconfiguring the MSR to do a reset on a machine check and (b) causing a machine check to occur. Item (b) is typically done by jumping to a memory location that doesn't exist. I suspect that in your case, location 0xfff00100 _does_ exist: it is the reset vector in your ROM. Try setting addr to an invalid location. gvb ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
