[U-Boot-Users] Download of kernel Image through Serial Line.
wolfgang.grandegger at bluewin.ch
wolfgang.grandegger at bluewin.ch
Wed Jan 29 11:51:17 CET 2003
>-- Original Message --
>From: Christophe.LINDHEIMER at fr.thalesgroup.com
>To: u-boot-users at lists.sourceforge.net
>Subject: [U-Boot-Users] Download of kernel Image through Serial Line.
>Date: Wed, 29 Jan 2003 10:38:13 +0100
>
>
>Hi.
>
>Just a beginner with U-Boot.
>
>In my new project we are trying to use Linux and U-Boot.
>
>The main problem I have is that I don't have any ethernet link on this card.
>
>- Is it possible to configure U-Boot to make a download of the image using
>the serial line ? ( tftp over serial line or something like that )
>
>- If it is not possible would it be a big work ?
You could use kermit binary download. Check for example chapter
4.10.5.3 of our DENX PPCBoot and Linux Guide at
http://www.denx.de/doc/TQM8xxL.
>- If I eventually manage to launch Linux, is it possible to have NFS over
>serial line ?
This does not sound very promising to me. A root filesystem
on a JFFS2 or CRAMFS partition might be the better option.
>- What are the minima requests in terms of memory to run Linux ?
>- Minimum Ram Size
4MB or better 8MB.
>- Minimum Flash Size if I don't use NFS ( full embeded application )
4MB. For a resonable 'standard' Embedded Linux runtime
environment for PowerPC including basic network support
you need approx. the following space in Flash:
U-Boot : 120 KB
Linux kernel : 600 KB
RAMDisk image : 1 MB
Root file-system on JFFS2: 2.5 MB
And development and debugging without network will be
quite cumbersome, I imagine. A hardware debugger would
be of great help also for image download. Abatron's
BDI2000 is a _great_ tool.
Hope it helps,
Wolfgang.
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