Re: [PATCH] mtd: spi-nor: spansion: Remove s70fl01gs from flash_info

[Takahiro Kuwano <kuwano.takahiro@gmail.com>]

On 7/3/20 9:20 PM, Tudor.Ambarus@microchip.com wrote:
> On 6/26/20 8:16 AM, kuwano.takahiro@gmail.com wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>>
>> From: Takahiro Kuwano <Takahiro.Kuwano@cypress.com>
>>
>> The s70fl01gs is a dual die stack of two s25fl512s die with dedicated chip
>> select pins to each. Tested with the device and confirmed that is working
>> as two s25fl512s devices. The current device ID in the flash_info table
> 
> Right, the datasheet specifies too that the S70FS01GS device is a dual die
> stack of two FS512S die.
> 
>> matches with s70fs01gs which does not work with current MTD.
> 
> s70fs01gs is not correctly supported indeed, but the lower half of it
> (first s25fl512s die) should work. Can't you correctly read/erase/write
> on the lower half of the s70fs01gs flash with the current code?

No, because the S70FS01GS does not support RDSR(05h) which is critical
for erase/write. The S70FS01GS is a dual die stack with one chip select.
Accessing to the registers requires RDAR(65h)/WRAR(71h) designating die
and register address.  

Best Regards,
Takahiro


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