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Old 09-23-2017, 03:39 PM
Teddy Boom Teddy Boom is offline
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Join Date: Jun 2012
Posts: 14
Default Write protection on SPI flash?

Working on some VDSL modems. Whenever I write the full dump from one particular model to an SPI flash, the chip can no longer be erased/written. I am holding both HOLD# and WP# high.

Doesn't matter if the chip is in system or loose on my desk. Tested with the stock flash from the device, of course. I've also written the dump to an MX25L128, but once written, that chip can't be written to again either.
(technically, written, soldered into PCB and run once, then desoldered--that might matter I guess )

I did a tiny bit of reading about the status register on SPI flash, but I'm not seeing the key bit of info..

Am I doing something wrong? Maybe I can edit the hex file to remove this apparent write protection?
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