Linear memory access

Linear memory access

[Frederic Marmond]

hi all,

I'd like to access to a memory area on a mtd device, without having 
compiling the mtd support in the kernel.
(read a firmware info, on a embeded environment => kernel as small as 
possible)
Is there any isue?

I mean:
is the device mapped anywhere, or is it really invisible, if i don't 
compile the mtd support?
If it is visible (how can i check that point?) do you know if there is 
any way to access it (like in flat mode, by a largest descriptor or 
something...)?


thanks for answers!

Fred

Re: Linear memory access

[Konstantin Boldyshev]

On Wed, 12 Jun 2002, Frederic Marmond wrote:

> I'd like to access to a memory area on a mtd device, without having
> compiling the mtd support in the kernel.
> (read a firmware info, on a embeded environment => kernel as small as
> possible)
> Is there any isue?
>
> I mean:
> is the device mapped anywhere, or is it really invisible, if i don't
> compile the mtd support?
> If it is visible (how can i check that point?) do you know if there is
> any way to access it (like in flat mode, by a largest descriptor or
> something...)?

It should be visible, but you need to know its address.
If you want to access it from userspace, use /dev/mem.
(from kernelspace all is as usual).

-- 
Regards,
Konstantin

Linear memory access, and register-modifier debugger

[Frederic Marmond]

I'm sorry to send it again, but I had troubles with my suscribtion, 
obliged to re-suscribe to the list
So, (as the archive is down) i couldn't read any (if any) answer...
could you please re-post me answer if, if you have one...

by the way:
I'm looking for a debugger capable of changing  registers while 
executing the code (during a break-point for exemple), or/and best, 
modifying the code itself in memory.
for the code
brk        :08048081 6689c0                 mov  ax, ax
when steping to this breakpoint, filling the 6689c0 by 909090, to 
disable this wonderfull instruction, and step to the following! ;-)

ok, I know, there are 'pro' debuggers under windows.
I've use turboDebugger (borland, under dos) from my young time...
but now, under GNU/linux, I miss it!
(perhapse that under Linux, there is no bug at all, opposate to 
windows... ;-))


thanks in advance!
Fred

> Hi all,
>
> I'd like to access to a memory area on a mtd device, without having 
> compiling the mtd support in the kernel.
> (read a firmware info, on a embeded environment => kernel as small as 
> possible)
> Is there any isue?
>
> I mean:
> is the device mapped anywhere, or is it really invisible, if i don't 
> compile the mtd support?
> If it is visible (how can i check that point?) do you know if there is 
> any way to access it (like in flat mode, by a largest descriptor or 
> something...)?
>
>
> thanks for answers!
>
> Fred
>
>