28 Apr
2005
28 Apr
'05
5:50 p.m.
"KokHow Teh" KokHow.Teh@marconi.com wrote on 2005-04-28 03:12:14:
The reason of the crash was because I put get_ram_size() before the sdram controller was initialized. I don't know how it works in sbc8240 but this is what I get in tqm8260:
/* We must be able to test a location outsize the maximum legal size
- to find out THAT we are outside; but this address still has to be
- mapped by the controller. That means, that the initial mapping has
- to be (at least) twice as large as the maximum expected size.
*/
The initial mapping does not have to be (at least) twice as large as the maximum expected size. This comment may be a result of an old bug in get_ram_size() which performed a test at base + max_size. The function now stops testing when it has found max_size bytes.
Of coarse the controller still has to be initialized and map max_size bytes before calling the function.
Chris