Any MPC8xx PCMCIA experts out there?
I have a problem I was hoping someone can help me out with.
My hardware is very similar to the MPC885ADS (DUET) board.
I have the PCMCIA interface working fine in Linux 2.4.26
I have recently enabled the PCMCIA support in u-boot. It also seems to be working just fine.
My problem is, that once I enabled PCMCIA in u-boot, when Linux comes up, my hardware hangs in the Linux PCMCIA initialization code.
I have traced the hang down to an instruction in _fpqpcmcia_reset() which is in the file .....kernel/drivers/pcmcia/pqpcmcia.c
The following code snipet shows where the hang occurs:
/* reset the mem/io windows */ /* 01 mem_win slot_A ... 0N mem-win slot_A 01 io-win slot_A ... 0N io-win slot_A 01 mem-win slot_B ... 0N mem-win slot_B 01 io-win slot_B ... 0N io-win slot_B */ for ( i = p_ctx->first_mem_win; i < (p_ctx->first_mem_win + p_ctx->mem_wins_num); i++ ) { p_ctx->REGS->win[i].pbr = 0; /******************* HANGS HERE **********/ p_ctx->REGS->win[i].por = 0; } for ( i = p_ctx->first_io_win; i < (p_ctx->first_io_win + p_ctx->io_wins_num); i++ ) { p_ctx->REGS->win[i].pbr = 0; p_ctx->REGS->win[i].por = 0; }
I've tried doing a reset of the PCMCIA (*p_ctx->pgcr = Q_PCMCIA_PGCRX_CXRESET;) in various places before this Linux initialization takes place, but it just causes kernel crashes. I've also tried doing the reset earlier on. I'm kind of stumped on this one. Is there a way to get the PCMCIA into the state it was at reset, without resetting?
I was hoping to fix this problem without becoming a ppc PCMCIA guru. I am using the MPC870. Does this ring a bell with anyone here?
Regards, - Mike