-- Original Message -- From: Christophe.LINDHEIMER@fr.thalesgroup.com To: u-boot-users@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.