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

[thomas.langer at lantiq.com]

> 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.

> 
> Best regards,
> Marek Vasut

Best regards,
Thomas