[U-Boot] [PATCH v3 3/3] spi-nor: spi-nor-ids: Add USE_FSR flag for mt25q* and n25q* entry

[Vignesh Raghavendra]

Hi Jagan,

On 23/10/19 12:00 AM, Jagan Teki wrote:
> Hi Vignesh,
> 
> On Fri, Oct 11, 2019 at 1:28 PM Vignesh Raghavendra <vigneshr at ti.com> wrote:
>>
>> n25q* and mt25q* (both 256Mb and 512Mb) flashes support Flag status
>> register that indicates various errors that may be encountered during
>> erase/write operations. Therefore add USE_FSR flag wherever missing.
> 
> Does 256Mb require FSR? I remember Micron die is created after 512Mb
> where it creates die between two 256Mb on 512Mb flash. Indeed die
> switching would require FSR.
> 

Flag Status Register(FSR) is not for switching die but for looking up and 
printing out reason for write/erase failure. And yes 256Mb part does 
support FSR. See datasheet at:
https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/n25q/n25q_256mb_1_8v.pdf
Table 17: Flag Status Register Bit Definition

https://www.mouser.com/datasheet/2/671/MT25Q_QLJS_U_256_ABA_0-1387271.pdf
Table 5: Flag Status Register


-- 
Regards
Vignesh