Hi, We are seeing NOR write failures on 6 of the 10 boards (DM6446 ARM SoC with Numonyx JS28F256M29EWL NOR flash chip). Four of the boards seem to work without error. All 10 boards were made on the same manufacturing line at the same time.
Initially, we couldn't properly read the QRY response from the chip. We had to use this patch http://www.mail-archive.com/u-boot@lists.denx.de/msg26614.html We are getting 'flash not erased' error or timeout error. We have tried monitoring D7 (busy) and monitoring D6 (activity toggle) to detect erase / program command completion / timeout. We have tried changing the timing of the control signals to the NOR chip, but need to use a logic state analyzer to verify the timing is changed as expected. Example error output: > cp 0x81700000 0x02000000 0x400000 Copy to Flash... Flash not Erased Timeout writing to Flash > cp 0x81700000 0x02000000 0x400000 Copy to Flash... Flash write timeout at address 2000000 data 129f34 We have tried cp, cp.b, cp.w and get the same results. With 4 boards working correctly, the code must be close. Any suggestions (beyond looking at the signals with a Logic State Analyzer)? Todd
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