7 May
2014
7 May
'14
5:01 p.m.
Am 07.05.2014 12:22, schrieb Taeung:
What mean 'DMAMEM' ?
The ethernet part of the i.MX reads/writes directly the received/sent Ethernet frames into/from RAM. So I need to alloc some space where the buffers are stored.
And What is the function of which name is 'Mmio_ram()' ?
The CPU needs uncached access to this RAM so that the driver sees the received bytes (and not the values from the cache).
See also: 20110510162658.GG4941@os.inf.tu-dresden.de Am 10.05.2011 18:26, schrieb Adam Lackorzynski:> Hi, [...]
'io' has the feature to get uncached memory, defining a resource Mmio_ram(size_in_bytes, 1_for_superpages_0_otherwise) in the configuration. That's the official way of getting uncached memory.
Martin