[U-Boot] [PATCH] sf: Fix s25fs512s erase size and remove SECT_4K flag

[Suresh Gupta]

> -----Original Message-----
> From: Jagan Teki [mailto:jagan at amarulasolutions.com]
> Sent: Wednesday, June 07, 2017 12:33 PM
> To: Suresh Gupta <suresh.gupta at nxp.com>
> Cc: york sun <york.sun at nxp.com>; Jagan Teki <jagannadh.teki at gmail.com>; u-
> boot at lists.denx.de; Jagan Teki <jagan at openedev.com>; Yao Yuan
> <yao.yuan at nxp.com>
> Subject: Re: [U-Boot] [PATCH] sf: Fix s25fs512s erase size and remove SECT_4K
> flag
> 
> Hi Suresh,
> 
> This what I understood based on my previous datasheet read __attached__
> 
> In spansion S25FS-S family the physical sectors are grouped as normal and
> parameter sectors. Parameter sectors are 4kB in size with 8 set located at the
> bottom or top address of a device.
> Normal sectors are similar to other flash family with sizes of 64kB or 32 kB.
> 
> To erase whole flash using sector erase(D8h or DCh) won't effect the parameter
> sectors, so in order to erase these we must use 4K sector erase commands (20h
> or 21h) separately.
> 
> So the lower 8 4k sectors are unaffected even if we do sector erase(d8h)? What
> if we do 4k erase(20h) whole flash all effected?

Erasing flash with 4k erase(20h) do not erase the whole chip and also not able to erase address
Space of remaining sectors of 256 kbytes . this I tried with my experiments.

So best way is to disable hybrid mode and configure flash in Uniform Sector Architecture   
> 
> thanks!
> --
> Jagan Teki
> Senior Linux Kernel Engineer | Amarula Solutions U-Boot, Linux | Upstream
> Maintainer Hyderabad, India.