On Wed, Jun 7, 2017 at 1:11 PM, Suresh Gupta suresh.gupta@nxp.com wrote:
-----Original Message----- From: Jagan Teki [mailto:jagan@amarulasolutions.com] Sent: Wednesday, June 07, 2017 12:33 PM To: Suresh Gupta suresh.gupta@nxp.com Cc: york sun york.sun@nxp.com; Jagan Teki jagannadh.teki@gmail.com; u- boot@lists.denx.de; Jagan Teki jagan@openedev.com; Yao Yuan yao.yuan@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
OK, then send patches to Linux and U-Boot will review and take other suggestions too.
thanks!