Hi all, My problem is that I have to write a driver for a co-processor on a board which we will use, at my work, as an embedded controller. The board itself is based upon a 486. The co-processor has been bolted onto the PCI/ISA bridge with nine of its pins. I am almost where I can start to access it but I have a few remaining questions. This is what I know: 1) I have to enable all GPIOs on the board before I can access the co-processor. This is done by writing 0x2 to register offset 0x40 at the PCI data configuration register. Before doing so I have to enable reads and writes to this register. These two lines does that: /* Write to the pci configuration address register */ outl(0x80000000 | (0xc << 11) | (0x40 << 2), 0xcf8) /* Write to the pci configuration data register */ outb(0x02, 0xcfc) But.. a) Do I need to do a request_region()/release_region() for both addresses around these lines of code ? b) Do I need to disable interrupts while writing to these registers ? c) Do I need to reset 0xcf8 after having written to 0xcfc ? Thanks a lot in advance! jules -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
