Re: [PATCH 0/3] Request direct mapping for modem firmware subdevice

On Mon, Mar 09, 2020 at 11:52:52PM +0530, Sibi Sankar wrote:

The Q6 modem sub-system has direct access to DDR through memnoc and
an indirect access routed through a SMMU which MSS CE (crypto engine
sub-component of MSS) uses during out of reset sequence. Request direct
mapping for the modem-firmware subdevice since smmu is not expected
to provide access control/translation for these SIDs (sandboxing of the
modem is achieved through XPUs engaged using SMC calls).

So the DMA accesses are initiated by the firmware and need to be direct
mapped? Which memory region do they access?

Regards,

	Joerg