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Old 01-08-2020, 01:30 PM   #1
Registered: Mar 2005
Posts: 157

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U-boot does not recognize SPI flash chip

I have a board for which I need to configure u-boot to boot from SPI flash. To get started, I set up the board for a UART boot and loaded a UART build of u-boot. This works fine, and I have a u-boot prompt.

My next step was to use the `sf probe` command to find the flash chip. It reports the following:
> sf probe 1
SF: Unsupported manufacturer 20
The SPI flash is an ST Micro chip, so I expect the manufacturer to be ID 20. It also appears that in the u-boot code itself, ST Micro chips are identified by ID 20. It still throws this error, though.

How should I proceed from here? The board is known to be fine (there is an alternate method of booting which we can test), and u-boot has supported ST Micro SPI flash chips for years.


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