[U-Boot] [PATCH] cmd_sf: add handler for +len arg for all commands

[Maxime Hadjinlian]

On Sun, Oct 5, 2014 at 9:19 PM,  <thomas.langer at lantiq.com> wrote:
>> On Sunday, October 05, 2014 at 08:40:26 PM, Maxime Hadjinlian wrote:
>> > Hi Thomas, all,
>> >
>> > On Sun, Oct 5, 2014 at 7:43 PM,  <thomas.langer at lantiq.com> wrote:
>> > > Hello Maxime,
>> > >
>> > > can you explain the usecase?
>> > > I think, only the erase is executed per sector, all other commands are
>> > > working fine with a byte oriented length.
>> >
>> > I need to write a file that is downloaded through TFTP. So I can get
>> > the filesize through the variable of the same name, but if it's not
>> > rounded, the write command may fail.
>> > I can save the filesize in another variable, but at next boot, when I
>> > need to read this file, I can't read the file, since I only know it's
>> > size in byte, I need to be able to round it again.
>>
>> I wonder, do all SPI flashes need to do sector-aligned writes ?
>
> All the serial flashes I have seen so far do support reading and writing with any
> length, independent from the erase size.
> Otherwise the current implementation of env_sf.c would also not work.
Well the QSPI, I used, does not. Every read and write has to be
aligned. That's why I needed that in the first place.
>
>>
>> Best regards,
>> Marek Vasut
>
> Best regards,
> Thomas