15 Nov
2006
15 Nov
'06
6:53 p.m.
On Nov 15, 2006, at 12:14 PM, Thomas Schafer wrote:
Is this a known issue? Why is the RAM not longer accessible after the 2nd initialization?
The software 'reset' in u-boot only causes the e500 core to reset, none of the peripherals nor memory controllers. Whacking the DDR setup again in this state just makes a big mess.
The only proper way to do this is with a board design where you can drive the external reset out of the processor, with external hardware that will then "loop" this back as a hard reset. See HRESET_REQ in the RSTCR. It's a simple patch that I guess I could submit :-) Not all board designs support this, though.
Thanks.
-- Dan