On Tue, Jan 02, 2024 at 08:31:15AM -0700, Jeffrey Hugo wrote: > On 12/25/2023 12:47 AM, Qiang Yu wrote: > > From: Bhaumik Bhatt <quic_bbhatt@xxxxxxxxxxx> > > > > Forcing the device (eg. SDX75) to enter Emergency Download Mode involves > > writing the 0xEDEDEDED cookie to the channel 91 doorbell register and > > forcing an SOC reset afterwards. Allow users of the MHI bus to exercise the > > sequence using a sysfs entry. > > I don't see this documented in the spec anywhere. Is this standard behavior > for all MHI devices? > > What about devices that don't support EDL mode? > > How should the host avoid using this special cookie when EDL mode is not > desired? > All points raised by Jeff are valid. I had discussions with Hemant and Bhaumik previously on allowing the devices to enter EDL mode in a generic manner and we didn't conclude on one final approach. Whatever way we come up with, it should be properly described in the MHI spec and _should_ be backwards compatible. - Mani > -Jeff -- மணிவண்ணன் சதாசிவம்
