On 10/2/20 9:50 AM, David Laight wrote: > From: Bert Vermeulen >> The SoCs I'm dealing with have an SPI_ADDR_SEL pin, indicating whether it >> should be in 3 or 4-byte mode. The vendor's hacked-up U-Boot sets the mode >> accordingly, as does their BSP. It seems to me like a misfeature, and I want >> to just ignore it and do reasonable JEDEC things, but I have the problem >> that the flash chip can be in 4-byte mode by the time it gets to my spi-nor >> driver. > > If these are the devices I think they are, can't you read the > non-volatile config word (bit 0) to find out whether the device > expects a 3 or 4 byte address and how many 'idle' clocks there > are before the read data?
I'm working with Realtek RTL838x/RTL839x SoCs. Reading it out is a pretty convoluted procedure involving different I/O registers depending on the SoC model. -- Bert Vermeulen b...@biot.com