On 1/3/2024 12:52 AM, Manivannan Sadhasivam wrote:
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.
Hi Mani, Jeff. The method of entering EDL mode is documented in MHI spec
v1.2, Chapter 13.2.
Could you please check once?
- Mani
-Jeff
