Hi, Wolfgang:
You wrote:
>You don't allocate space and assign it a physical
>address, it's exactly the other way round:
>
>There is some physical memory starting at phys_addr
>with a certain size, and you use ioremap()
>resp. ioremap_nocache() to get it's virtual start
>address.
Really, there are two problems:
1.- I have to allocate memory inside the PPC860T
dual-port RAM for the buffer descriptors. I have
seen in the Linux kernel source that it uses
m8xx_cpm_dpalloc()
function.
2.- I have to allocate memory somewhere else in
RAM in order for the DMA to handle the communication
data from/to the controller. Linux kernel uses
m8xx_cpm_hostalloc()
to get some space from RAM, and then
_pa()
to translate virtual into physical address for the
buffer descriptor field "Buffer Pointer".
In my case, when trying to use these functions
in my RT-Linux module, it fails when loading
the module.
In the first case, I need any means of getting
some space from the dual-port RAM that hasn�t been
previously allocated by Linux
In the second case, first I need some contiguous
space in RAM, and then translate the virtual address
into a physical one.
In others words, how can I get in a RT-Linux module
the functionality I need? Can I use the above functions
in the "init_module()"? If so, need I link my module
with any other?
Thank you in advance
Billa
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