[flashrom] 64Mbit IS25LP064A not recognized

[Buhrow, Simon]

Hi,

Having a 64Mbit IS25LP064A and using flashrom 1.0, when calling
sudo flashrom -p ft2232_spi:type=2232H,port=A,divisor=100

I get:
flashrom v1.0 on Linux 4.15.0-33-generic (x86_64)
...
Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found Generic flash chip "unknown SPI chip (RDID)" (0 kB, SPI) on ft2232_spi.
...


:(
Writing and reading commands break with the same message.

So I checked the table at https://www.flashrom.org/Supported_hardware
The chip is not supported yet. But it says that chips supporting JESD216 should work.

Measuring the signal I got that the command given above does first a RDJDID Operation and later the RDSFDP operation (which should be according to JESD216).
I attach the signals. You can see the the operations and what is done.
According to the datasheet is MF7-MF0: 9Dh and Memory Type + Capacity (ID15 - ID0): 6017h. Which you can see on the RDJDID signals image.

I know the signal quality is not the best but doing real improves would cost a lot of time. As I already successfully programmed another supported chip and because the Flash chip response the right way I think that it´s not a signal integrity problem.

So my questions are:
1)      Does "unknown SPI chip (RDID)" mean "it´s not in the database" or does it mean "RDID could not be read successfully"?
2)      If it means "RDID could not be read successfully": Is there any other possibility than signal integrity why flashrom does not show the right RDID?
3)      If it means "it´s not in the database":  Would adding it to the database solve the problem or is that not crucial?
4)      Does flashrom supports flashs with memory of 64Mbit? As I can´t find any in the supported hardware list.




The datasheet of the flash can be obtained from:
https://www.mouser.de/datasheet/2/198/25LP032-64A-B-737452.pdf

Btw: the JESD216 link at https://www.flashrom.org/Supported_hardware does not work. May be https://www.jedec.org/standards-documents/docs/jesd216b is what should be linked?



Regards,
Simon




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