On Tuesday 24 May 2005 21.19, Niklaus Giger wrote:
> Hi
>
> I am working on a custom PPC405 board where I have a 2.6.10 kernel with
> RTAI patches (fusion) running.
>
> I am trying to access some custom CPLD chip hanging at 0x7D000000. In my
> intial board (hcu3_map_io) I added a corresponding io_block_mapping.
>
> I can see the CPLD when I access the address via my Abatron BDI debugger.
>
> In a user space test program I did a
> map_base = mmap((void *)target, nSize, PROT_READ | PROT_WRITE,
> MAP_SHARED, fd, target);
> and was able to access the CPLD, too.
Via 'map_base' I guess?
For kernel try
virt_base=ioremap(target, nSize)
>
> In user and kernel space the procedure looks like this:
> void sys_set_tick_control_register_value(uint16 value)
> {
> static uint16 *tickControlRegister = (uint16*)
> HCU_TICK_CONTROL_REGISTER_ADDRESS;
This indicates that you tries to read directly from an adress (no virt_base?)
You might want to use __raw_readl instead (depending on bus endianess).
/RogerL
