On Nov 15, 2004, at 11:10 AM, morten.banzon at axxessit.no wrote:
> I am using 2.6.9 for a mpc8280 project, and am having trouble using
> dpram1
> from offset zero, which I need for a mcc hdlc driver.
Why does it have to start at zero?
> In the file include/asm-ppc/cpm2.h there is a constant
> CPM_DATAONLY_BASE
> In the same file the code comment say that the first 128 bytes are used
> for SMC1 and SMC2.
Yes, it is.
> When I examine the smc (cpm_uart) driver i do not find any reference to
> this region of the dpram1.
It's there somewhere, hardcoded with values 0, then sizeof() something
is
probably added to it.
> I have replaced the calls to cpm_dpalloc with cpm_dpalloc_fixed and an
> adress way up in the dpram1 region.
Very bad idea.
> My question is; do you know which code is using the dpram1 addresses
> below
> CPM_DATAONLY_BASE ?
The SMC1 and SMC2 peripherals, just like the comment says.
> This region must be used by something (smc ?), because when I clear
> from
> offset 0x00 to 0x80 the serial port stop responding.
Yep.
-- Dan
