Hi! The last 2 weeks I worked full time on PCMCIA. We have a custom board with a MPC860T 10/100MBit Ethernet one PCMCIA slot 8MB flash and 32MB RAM.
First at all: It works now fine. And I want to thank everyone who posted information to this issue (Magnus Damm, Matthew Locke, Wolfgang Denk and all others). But this the point for my mail: It was/is very difficult to get all needed information, to get it to work, so I want to list my steps there, that it is maybe easier to do this work again. O.K. here is a history of my work: I linked the pcmcia stuff directly to the kernel (driver/pcmcia), because I think I understand it right Wolfgang, your PCMCIA onyl works if PPCBoot setup the PCMCIA port. But we don't use PPCBoot (shame about that .... ) and it seems to be to complicated/more work to add the whole stuff into our boot up sequence. I know that we loose the possibilty to mount root from a flash card, but we could live with that. Maybe Wolfgang has another hint for me ... :-) However, I start of course where everyone startet: http://lists.linuxppc.org/linuxppc-embedded/200002/msg00093.html and http://lists.linuxppc.org/linuxppc-embedded/200005/msg00227.html. We portet also the mvista kernel 2.4.2 to the denx kernel 2.4.4 Then I add the _IO_BASE etc to the board specific h file and ioremap it as desribed (arch/ppc/kernem/mm/init.c) -Fine- Next step was to add the m8xx_pcmcia.c file to drivers/pcmcia and adapt the Config.in and Makefile. Then I do the board specific stuff for power supply in m8xx_pcmcia.c. Till now everything works fine. But from this point on it becomes difficult, because from now on the interrupts comes up. The first issue was in cs.c in drivers/pcmcia in the function pcmcia_request_irq /* Short cut: if there are no ISA interrupts, then it is PCI */ #if 0 if (!s->cap.irq_mask) { irq = s->cap.pci_irq; ret = (irq) ? 0 : CS_IN_USE; printk("Uhu: %08x %08x\n",s->cap.irq_mask,s->cap.pci_irq); #endif if (s->cap.irq_mask == (1 << s->cap.pci_irq)) { irq = s->cap.pci_irq; printk("Uhu: %08x %08x\n",s->cap.irq_mask,s->cap.pci_irq); #ifdef CONFIG_ISA } else if (s->irq.AssignedIRQ != 0) { /* If the interrupt is already assigned, it must match */ irq = s->irq.AssignedIRQ; if (req->IRQInfo1 & IRQ_INFO2_VALID) { u_int mask = req->IRQInfo2 & s->cap.irq_mask; ret = ((mask >> irq) & 1) ? 0 : CS_BAD_ARGS; } else ret = ((req->IRQInfo1&IRQ_MASK) == irq) ? 0 : CS_BAD_ARGS; } else { ret = CS_IN_USE; if (req->IRQInfo1 & IRQ_INFO2_VALID) { u_int try, mask = req->IRQInfo2 & s->cap.irq_mask; for (try = 0; try < 2; try++) { for (irq = 0; irq < 32; irq++) if ((mask >> irq) & 1) { ret = try_irq(req->Attributes, irq, try); if (ret == 0) break; } if (ret == 0) break; } } else { irq = req->IRQInfo1 & IRQ_MASK; ret = try_irq(req->Attributes, irq, 1); } #else /* Right now m8xx specific */ } else if (s->irq.AssignedIRQ != 0) { /* If the interrupt is already assigned, it must match */ irq = s->irq.AssignedIRQ; if (req->IRQInfo1 & IRQ_INFO2_VALID) { mask = req->IRQInfo2 & s->cap.irq_mask; ret = ((mask >> irq) & 1) ? 0 : CS_BAD_ARGS; } else ret = ((req->IRQInfo1&IRQ_MASK) == irq) ? 0 : CS_BAD_ARGS; } else { ret = 0; irq = 7; //SIU_LEVEL4 #endif } The #if 0 and #if CONFIG_ISA tree is the original one, and the #else /*Right now m8xx specific */ part was taken from sourceforge pcmcia-cs 3.2.4. The last point was the request_irq function. I don't change the defines in the h files, I change the function itself: arch/ppc/kernel/ppc8xx_pic.c. There (in request_irq) I call always the request_8xxirq function. >From now on it works. I used for the first steps the file system from the eldk >and copy then the necessary files (cardctl, cardmgr, scripts) to our >filesystem. I hope I didn't forget anything, please tell me if I've done a lot of nonsense, and I hope this will help in future if anyone has to do these steps anyway best regards Gerhard ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
