Re: My problem of I/O port

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Hi,

     And I have some questions to ask:
    1. I used the l4linux-2.6.30 kernel, now to booting it besides

fiasco default config, there is [ *] Enable I/O port protection feature must need, isn't it? It not needed in l4linux-2.6.23 kernel or earlier.

This is not a Linux feature, but one from the Fiasco kernel. You should have it enabled by default. It basically prevents applications from accessing I/O ports unless they are the first to access these. Otherwise, your application needs to get them mapped (using an I/O flexpage) from an application that has access to the IO/ ports.

    2. Will this feature prevent the other server to access to the io

port? I seems meeting this problem, my parport server(#b) want to access the port 077a, but system say the owner is #a(l4io), even I set the parport priority higher than l4io, it also the same problem. the last error message is like follow: ............................... server | <6>parport0: PC-style at 0x378 [PCSPP,TRISTATE] server | <6>parport0: irq 7 detected ROOT: Cannot send port 077a to task #0b, owner is #a ROOT: task B.00 at 01804299 is trying to get I/O port 077a allocated by task 0b.

What are tasks A and B? Assuming A is your parport server and B is L4IO, then you need to call l4io_request_region() to retrieve the ports you want to access from L4IO. As your parport server is DDE-based you can also do this using Linux' means (request_region()).

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     How can I do could make the parport server run together with the

l4linux, or to make it could access the port it needed?

I don't see where L4Linux comes into play here?

Bjoern