Hai friends I am writing a Linux device driver for Diamond systems IR104 digital IO card. This is a PC104 bus device(that means it ISA bus compatible). The Platform is Arcom Viper borad(with support for PC104), This is a Xscale, Little endian Platform.
The Specification of PC104 given in Viper borad manual is:
0x3C000000-0x3CFFFFFF PC/104 memory space(16MB)
0x30000000-0x300003FF PC/104 IO space(1KB)
Specification given in IR104 manual is: I made the jumber setting so that, the IO space addresses taken by 8 registers will be 0x300-0x307
The driver should do read and write on this registers(character device driver).
I took two approaches one is: i added IO space and 0x300, did inb() and oub().(IO space base address and 0x300) otherway i did ioremap on added result, did inb() and oub(). both are giving errors, i think that is related to paging. i think there is a need for disabling paging in this space.
In the second method: I did same procedures using IO memory space
Please help regarding this. How to solve this.
Nobin Mathew