On 1/2/2024 11:31 PM, 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?
This is documented in MHI spec v1.2, 13.2 Emergency download (EDL) mode
cookie. So I think
it is standard behavior. At least, SDX65 and SDX75 support it.
What about devices that don't support EDL mode?
How should the host avoid using this special cookie when EDL mode is
not desired?
Can I include another flag in mhi_pci_dev_info and mhi_controller and
check this flag
before writing EDL cookie?
-Jeff
