[U-Boot-Users] Can I write to flash using mw command
bilahari
bilahari_akkiraju at yahoo.com
Fri Oct 13 01:19:46 CEST 2006
Ben Warren <bwarren <at> qstreams.com> writes:
>
> On Thu, 2006-10-12 at 15:11 +0200, Wolfgang Denk wrote:
> > In message <452E2DD0.3070409 <at> smiths-aerospace.com> you wrote:
> > >
> > > Back when I was a kid, all we had were ones. To make a zero we had to
> >
> > They changed it to zeros later, because a zero is much more powerful.
> > For example, leading zeros can be very powerful, expecially when you
> > employ them in the management of big companies. [BTW: that's the
> > difference between commercial and scientific notation: scientists
> > tend to suppress leading zeros.] And, to quote an ancient usenet
> > posting (sorry, the exact source is unknown to me):
> >
> > Zero is an enigmatic value. It can mean success (fclose) or failure
> > (scanf). It can mean black or white. It can mean no permissions
> > (chmod) or all permissions (umask). It can mean now (setjmp) or later
> > (atexit). It can mean the beginning (lseek) or the end (read). It can
> > mean myself (getpgrp) or child (fork). It can mean all (kill's 1st
> > argument) or nothing (kill's 2nd argument). It can mean `default'
> > (SIG_IGN) or `I don't care' (waitpid) or `try to guess' (strtol).
> > Indeed 0 lets you talk to God (setuid).
> > Verily is 0 all things to all people.
>
> Obligatory follow-on from a long-forgotten source:
>
> "The decline of the Roman Empire can be traced to the fact that, lacking
> zero, they were unable to return from their C programs"
>
> -------------------------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
> http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
>
Thank you all , learned the The Transcedental Truth about zero,
>From spansion documentation :-
<<
When Flash memory is erased, all the bits in the
erased area are set to a logical “1” (high signal level).
Programming selectively changes bits to a logical
“0” (Low signal level). Flash memory is traditionally
programmed a single byte or word at a time and erased one
sector at a time. Only an erase operation can return a “0”
back to a “1”(erased) state.
For Floating-Gate technology,
it is possible to re-program (or write over) a byte
or word that has been previously programmed without
first erasing the byte or word (as long as no attempt is
made to program a “0” to a “1”). This re-programming of byte
or word locations can be used to incrementally program
individual bits to “0.” This incremental programming is
useful to track the progress in multi-step programming
schemes such as those used in a Flash File System.
>>
More information about the U-Boot
mailing list