[PATCH 6/6] cmd: Add a memory-search command

[Simon Glass]

Hi Michal,

On Thu, 4 Jun 2020 at 07:05, Michal Simek <michal.simek at xilinx.com> wrote:
>
> On 04. 06. 20 15:00, Simon Glass wrote:
> > Hi Michal,
> >
> > On Thu, 4 Jun 2020 at 02:33, Michal Simek <michal.simek at xilinx.com> wrote:
> >>
> >> On 04. 06. 20 4:59, Simon Glass wrote:
> >>> Hi Michal,
> >>>
> >>> On Wed, 3 Jun 2020 at 01:08, Michal Simek <michal.simek at xilinx.com> wrote:
> >>>>
> >>>> On 03. 06. 20 3:26, Simon Glass wrote:
> >>>>> It is useful to be able to find hex values and strings in a memory range.
> >>>>> Add a command to support this.
> >>>>>
> >>>>> cmd: Fix 'md' and add a memory-search command
> >>>>> At present 'md.q' is broken. This series provides a fix for this. It also
> >>>>> implements a new memory-search command called 'ms'. It allows searching
> >>>>> memory for hex and string data.
> >>>>> END
> >>>>
> >>>> END likely shouldn't be here.
> >>>
> >>> Oops
> >>>
> >>>> Recently I have met with the case that I have strings in i2c eeprom and
> >>>> need to move them to variable. And I didn't find any way how to do it.
> >>>> That's why I am curious if you are introducing this new command to also
> >>>> in case of string search to fill any variable which will contain this
> >>>> string.
> >>>
> >>> Sorry it is just for memory-mapped things at present. But like we have
> >>> 'i2c md' I suppose we could have 'i2c ms'.
> >>
> >> It wouldn't matter. I can do i2c read to memory and then ms to do it.
> >> But question remains. When you find the string in memory how you want to
> >> work with it? You need to have a way to move it to variable and use it
> >> as the part of your script.
> >
> > Ah OK I didn't think of that.
> >
> > I suppose you could use $mempos to find it, if we had a way to move a
> > string from memory to an env var? Does that exist? If not, setexpr
> > could be enhanced to do it quite easily.
>
> You will find it that what's your ms does. But I haven't seen that
> setexpr part of that.
> Also when I find that string I should be able to for example write my
> variable to that location.
>
> What was the use case you had in your mind how you want to handle string
> when you find it?

My use case is just to interactively search memory for things - e.g.
ACPI tables, pointers to addresses and the like. Useful for debugging.

Regards,
Simon