[U-Boot] [PATCH 00/12] cmd_sf: Add support for read and write instructions

[Tom Rini]

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On 03/05/2013 12:00 PM, Jagan Teki wrote:
> Hi Tom,
> 
> On Tue, Mar 5, 2013 at 2:38 AM, Tom Rini <trini at ti.com> wrote:
>> On Sat, Mar 02, 2013 at 01:59:38PM +0530, Jagan Teki wrote:
>> 
>> [snip]
>>> Since these changes I have sent long back, I am just
>>> re-modified the framework to add new features at the same time
>>> with backward comparability for current commands.
>>> 
>>> Current command setup: sf write sf read sf update
>>> 
>>> Changed command set: [no changes in the argument count] sf
>>> write     ---  current command sf write.pp --  same as sf
>>> write sf write.qp -- quad program
>>> 
>>> sf read   -- current read sf read.af --- array flast read, same
>>> as sf read sf read.as -- array slow read sf read.do --- dual
>>> out sf read.qo -- quad out sf read.dio -- dual io sf read.qio
>>> -- quad io
>>> 
>>> sf update  -- current update sf update.pp.af -- write page
>>> program, read array fast, same as sf update sf update.pp.as -
>>> write page program, read array slow sf update.pp.do - write
>>> page program, read dual out sf update.pp.qo - write page
>>> program, read quad out sf update.pp.dio - write page program,
>>> read dual io sf update.pp.qio - write page program, read quad
>>> io sf update.qp.af - write quad program, read array fast sf
>>> update.qp.as - write quad program, read array slow sf
>>> update.qp.do - write quad program, read dual out sf
>>> update.qp.qo - write quad program, read quad out sf
>>> update.qp.dio - write quad program, read dual io sf
>>> update.qp.qio - write quad program, read quad io
>>> 
>>> Though it seems to be lengthy, but may useful with lot of
>>> combinations from user. My intention is to use the existing
>>> argument count with changes in the command set.
>> 
>> Are there cases where for the current device we're operating on
>> that can handle more than one of these, aside from fast or slow?
>> And do we really need to offer both fast and slow?
> 
> Yes as per as I know spansion, numonyx and winbond flashes are
> supporting all the operation modes that I listed above.
> 
> These are very generic w.r.t above flashes.or I can say these are
> commonly available modes.

And when hooked up via whichever SPI controller you have, all of those
modes are also available and we can't really "guess" about using a
faster mode?

- -- 
Tom
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