help with extra memory

Posted by: oliver

help with extra memory - 27/04/2006 22:34

I just got around to testing the memory I had added to one of my spare empegs, and it didn't work on the first try. If anyone can help me out, I've tried to figure it out but I don't quite understand how to decrypt the text below. (complete boot log attached)

Checking for extra DRAM:
c1000000: wrote ffffffff, read e91ba9f0
Posted by: mlord

Re: help with extra memory - 27/04/2006 22:53

Quote:
c1000000: wrote ffffffff, read e91ba9f0


No chip select.
Posted by: oliver

Re: help with extra memory - 27/04/2006 23:25

So that would be the RAS1 line on the strongarm, or either of the stacked chips on pin 14, right?

Everything seems to have continuity, I haven't tested the resistance yet.
Posted by: mlord

Re: help with extra memory - 28/04/2006 01:40

Quote:
So that would be the RAS1 line on the strongarm, or either of the stacked chips on pin 14, right?


Right. Most likely at the RAS1 (pin 123?) of the SA-1100 CPU.

Or (much less likely) one of the control lines to the RAM chips (eg. the RW, CS, or OE lines).

-ml
Posted by: oliver

Re: help with extra memory - 22/10/2006 19:41

I just got around to trying to figure out this memory issue. After replacing a chip I'm now getting this error.

I'm really bad with decipher these error messages into binary to get the troubled pins. Can anyone help me out?

c1000000: wrote ffffffff, read aaaaffff
Posted by: oliver

Re: help with extra memory - 22/10/2006 20:07

Ok, I touched up a few pins that were open, now i'm getting this... does this mean everything is groovy? The one thing i'm wondering about, is the "Command line: mem=16m"




empeg-car bootstrap v1.02 20001106 ([email protected])
If there is anyone present who wants to upgrade the flash, let them speak now,
or forever hold their peace...it seems not. Let fly the Penguins of Linux!

e000 v1.04
Copying kernel...
Calling linux kernel...
Uncompressing Linux..................................... done, booting the kernel.

Linux version 2.2.17-rmk5-np17-empeg52-hijack-v455 ([email protected]) (gcc version 2.95.3 20010315 (release)) #2 Mon Apr 24 20:27:47 EDT 2006

Processor: Intel StrongARM-1100 revision 11

Checking for extra DRAM:

c1000000: passed.

c1100000: passed.

c1200000: passed.

c1300000: passed.

c1400000: passed.

c1500000: passed.

c1600000: passed.

c1700000: passed.

c1800000: passed.

c1900000: passed.

c1a00000: passed.

c1b00000: passed.

c1c00000: passed.

c1d00000: passed.

c1e00000: passed.

c1f00000: passed.

c2000000: wrote ffffffff, read 00000000

NetWinder Floating Point Emulator V0.94.1 (c) 1998 Corel Computer Corp.

empeg-car player (hardware revision 9, serial number 30102485) 32MB DRAM

Command line: mem=16m
Posted by: mlord

Re: help with extra memory - 22/10/2006 20:35

Everything is groovy. Ignore the "mem=16m" line -- that is just a factory firmware default for the mk2a.

-ml
Posted by: oliver

Re: help with extra memory - 22/10/2006 21:20

Excellent

Now, I have to figure out this stupid display fuse issue to actually use the memory. I'll be switching out the fuse with the one you sent me a few months ago. Hopefully that will fix the problem.

Thanks again!