Re: how to write info to a pci device

[sauro <sauro@xxxxxxxxxxx>]

I use Denx Embedded Linux on a PowerPC (MPC5200), and I use big endian 
direct access functions such as in_8, in_be16, in_be32, out_8, out_be16 
and out_be32.
Having the device mapped into memory, all I have to do is to use the 
right function in relation to the number of bits I want to write on it.


Bora SAHIN wrote:

> Eric> outb seem to be Intel specific and writeb need to map I/0 memory with ioremap
>
> Eric> Which method is more standard for a pci device (portable)?
>
> I think writeb() is more portable because e.g. in a PowerPC system you cant use inb(), outb()! Also
> PowerPC is big endian, PCI is little endian. Sometimes you may have to use byte/word/double
> word(Intel terminology) reverse inst. to access it in a PPC system. This functions can do it
> magically for you! 
>
>  

--
Sauro Salomoni

Ztec - Z Tecnologia em Comunicação
www.ztec.com.br

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