Cirrus Logic 5430 at 16 bpp and 800x600

[Paulo Henrique Baptista de Oliveira]

        Hi debian users,
        I'm having a problem setting a Cirrus Logic card model 5430 1Mb of RAM. 
It doesn't enter in XWindow at 800x600 at 16bpp. It complies about linear 
addressing that I don't know. 
        Anyone has this type of card?
        Have a nice day,                Paulo Henrique