Datasheet

VIPER / VIPER-Lite Embedded Linux Development Kit Quickstart Arcom Embedded Linux (AEL)

Hardware configuration

PC/104 bus

The PC/104 bus on the standard VIPER option is implemented via the second PCMCIA

controller built into the PXA255 processor.

The PC/104 I/O address space is mapped at physical address 0x30000000 and virtual

address 0xF1000000. This means that a PC/104 card that has been configured at I/O

address 0xXXX is available at virtual address 0xF1000XXX. This virtual address is the

correct value to use when configuring a device driver for that card, rather than the

associated physical address.

Previous versions of Arcom Embedded Linux on the VIPER using version 2.4

of the Linux kernel used 0xF7000000 as the offset for the PC/104 I/O

address space.

The PC/104 memory address space is available at physical address 0x3C000000. This

means that a PC/104 card that has been configured for memory address 0xXXXX is

available at physical address 0x3C00XXXX. It is the responsibility of the driver to map

this address into the kernel’s virtual address space before use.

The ‘vip’ example file on the CD (in /examples/c/) may be useful for very

simple user space PC/104 tests. This accesses physical PC/104 addresses

via /dev/mem.

PC/104 interrupts are mapped as shown in the following table:

PC/104 interrupt VIPER interrupt

3 104

4 105

5 106

6 107

7 108

10 109

11 110

12 111

9 112

14 113

15 114

For more information, see the VIPER / VIPER-Lite Technical Manual and PXA255

Developer’s Manual.