Re: [U-Boot-Users] SDRAM Burst Read/Write Test

In message 20040113135842.79885.qmail@web41401.mail.yahoo.com you wrote:
I am talking about initally booting U-Boot. The crash comes right after initializing the SDRAM, when it is moving U-Boot from the flash into SDRAM. So I can't run Linux. I have verified that this is a burst
You asked hot to verify that burst mode accesses are working correctly - the test with the best ratio of efficiency vs. reliability is to boot Linux :-)
read/write problem by inhibiting burst operations in the ORx register for the SDRAM. When I set OR_BI (SDRAM Burst Inhibit) U-Boot will move on to detecting the flash. If I allow bursts, I don't get to where U-Boot detects the flash, and the last printout I see is: New Stack Pointer is: 00f9ef78.
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For the N+1st time:
As pointed out several hundret times before, this usually has nothing to do with the UPM setup, but is a consequence of missing or bad initialization sequence of your SDRAM chips.
Implement the chip init sequence as documented in the RAM chip documentation.
Best regards,
Wolfgang Denk
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Wolfgang Denk