Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> writes:
>> .buf = "something",
>> ...
>> random data will be sent because buf is not DMA mapable ("something" is
>> located in the .strtab section within module memory). MXS has a memory
>> layout like
>
> DMA buffers must be located in lowmem *always*. This means placing them
> in the .data segment does not work. USB has been through this already
> and it's well known there...
Yes; I know about USB and this requirement is explicitly mentioned in
the 'struct urb' documentation. But I can not find something similar
for i2c_msg and lot of i2c drivers are working with non DMA mapable
buffers.
Enrico
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