[uClinux-dev] ARM evaluator 7t port

[Krzysztof Błaszkowski]

Hi,

Half a meg of RAM is not enough. I can show you typical memory footprint for
4510/4530 board with 1 piece of 8Meg sdram which is:

/> cat /proc/meminfo
        total:    used:    free:  shared: buffers:  cached:
Mem:   6930432  2600960  4329472        0   258048   356352
Swap:        0        0        0
MemTotal:         6768 kB
MemFree:          4228 kB
MemShared:           0 kB
Buffers:           252 kB
Cached:            348 kB
SwapCached:          0 kB
Active:            436 kB
Inactive:          164 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:         6768 kB
LowFree:          4228 kB
SwapTotal:           0 kB
SwapFree:            0 kB
/>

the 1.2M take kernel's text+bss and data segments. 2.5 M is used by all kind
of kernel caches and typical set of user space apps like: init, inetd,
telnetd, sh, portmap, etc.
With 0.5M of ram you can run eCos (without network layer likely) only.

Regards,
Krzysztof Blaszkowski

----- Original Message -----
From: "g. v. r. Š" <gvrtalks at hotmail.com>
To: <uclinux-dev at uclinux.org>
Sent: Friday, October 29, 2004 1:13 PM
Subject: Re: [uClinux-dev] ARM evaluator 7t port


> Greg, Thanks for the pointers. The funny thing is my board only has 512J
of
> RAM and 512K of ROM and the lower 64KB of ROM is occupied by BSL
bootloader.
>
> I'm guessing zImage will not be right as the kernel will then be
> uncompressed into RAM and very little RAM (in 10's of KB) will be left for
> the kernel to actually run. So I'm just compiling Image which is currently
> coming to 444KB. I'm downloading it to ROM and then attempting to run it
by
> issuing a 'go' command to that address from the bootloader. This way,
> atleast 512K RAM is available for kernel to run. However, what I observe
is
> that when I try this, the board jsut resets without a clue. I'm begiining
to
> wonder if 512K is enough for the kernel to actually run.
>
> Will greatly appreciate any advice - Thanks!!
>
> Has anybody actually got uCLinux working with this board? Google search
was
> also didn't turn up any leads :-(
>
> Rao!
>
> >From: "Greg Holdren" <greghol at sbcglobal.net>
> >Reply-To: uClinux development list <uclinux-dev at uclinux.org>
> >To: "uClinux development list" <uclinux-dev at uclinux.org>
> >Subject: Re: [uClinux-dev] ARM evaluator 7t port
> >Date: Fri, 29 Oct 2004 00:50:35 -0700
> >
> >
> >
> >
> > > Hi all,
> > >
> > > I'm trying to port uCLinux to ARM evaluator 7t board based on the
> >Samsung
> > > S3C4510/KS32C50100
> > > (ARM7TDMI). So far, I've tried the 2.4.27 kernel with uClinux patch
and
> > > chose the configuration for S3C4510-SND100 board as this seemed the
> >closest.
> > >
> > > Although zImage compiles fine with arm-linux-gcc (2.95.3), when I
> >download
> > > to the board (using redboot),  load the address and say 'go', it just
> >gets
> > > stuck there. I ensured in the kernel that the baud-rate is set to
> >RedBoot's
> > > baudrate but this didn't help.
> > >
> > > Does anyone have experience in porting uCLinux over to this board?
> >Thanks
> >in
> > > advance for any help provided.
> > >
> >
> >Try the uClinux dist. from http://sourceforge.net/projects/bios-lt/ using
> >the 20030922 version. If you cant get it to work with Redboot then try
> >Bios-lt located at the same project page. I have used it on several 4510B
> >boards w/8 MB SDRAM and 2MB Flash (29LV160).  You will have to trim down
> >the
> >options for 4MB SDRAM based boards.
> >
> >I would like to work with the project admin, lt-lemon, to patch it for
the
> >latest 2.4.x based uClinux dist. and get it put into the CVS.
> >
> >The dist. at http://ucrouter.ru/english/index.htm work great for boards
> >with
> >as low as 4MB of SDRAM out of the box.
> >
> >Greg
> >http://pages.sbcglobal.net/greghol/routers/compusa_router.html
> >http://hri.sourceforge.net/
> >
> >
> > > Cheers!
> > > Rao
> > >
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