Re: [ECOS] help with "hello world" over redboot

["Kai Yu" <kaiyu_bj at 163 dot com>]

Jay,

Thanks for your kind guide. Did finally make the "hello world" working on you snds and any more details on the tweaks?

I am still learning the eCos. I will need more advice and share my experiences here.

Kai
----- Original Message ----- 
From: "Jay Foster" <jay@systech.com>
To: "'Jonathan Larmour'" <jifl@eCosCentric.com>; "Kai Yu" <kaiyu_bj@163.com>
Cc: <ecos-discuss@sources.redhat.com>
Sent: Thursday, June 26, 2003 6:13 AM
Subject: RE: [ECOS] help with "hello world" over redboot


> I had RedBoot running on my SNDS100 board last year.  There were a few
> tweaks that I had to make to fix some things to get it to work.  I submitted
> some patches for these, but they never made it into the repository.  My
> experience was that no two SNDS100 boards are the same.  They apparently
> come with different size/kind of flash, SDRAM, SRAM, etc, and it also
> depends on how it is jumpered.  Mine had 16MB of SDRAM and the Winbond
> W29EE011 flash chips.  I also submitted a patch to add a flash driver for
> this chip.  I've attached what my recollection of the patches were, in case
> you find them useful.
> 
> I also remember trying to change the .fixed_vectors from 0x200 to 0x20, but
> it crashed.  I seem to remember it was overlaying something else at 0x20, so
> I left it at 0x200 and it seemed happy.  I have since moved onto other
> hardware, and am no longer using RedBoot, just eCos.
> 
> Jay
> 
> -----Original Message-----
> From: Jonathan Larmour [mailto:jifl@eCosCentric.com]
> Sent: Wednesday, June 25, 2003 12:36 PM
> To: Kai Yu
> Cc: ecos-discuss@sources.redhat.com
> Subject: Re: [ECOS] help with "hello world" over redboot
> 
> 
> Kai Yu wrote:
> > Hi,
> > 
> > I just started with eCos and Redboot. I have a Samsung SNDS board and I
> > loaded redboot on it with tftp support.
> 
> That's good. The default setup for SNDS in current CVS doesn't have the 
> ethernet drivers.
> 
>  > I can telnet and load image
> > onto it. When building the "hello world", I got two problem: 1. After
> > redboot boots up, the available ram is from 0x2exxx to 0x01000000, but
> > my "hello" need to be loaded to 0x020000
> >
> > I changed the install/include/pkgconf/mlt_snds_ram.ldi: rom_vector from
> > 0x0020000 to 0x0030000 to avoid this.
> > 
> > Am I righ?
> 
> Yes, since the default redboot didn't bank on including eth drivers. If 
> you send a patch for the eth drivers you can include that too :-). But 
> more changes are needed than that...
> 
> > 2. After load the hello binary onto SNDS board in redboot, "go" command
> > does not generate the expected result and I loss the redboot prompt
> > afterward.
> > 
> > What should I do the get the hello to run over the redboot?
> 
> It seems the SNDS has more problems with its MLT files than that. The 
> fixed vectors should be at 0x20 in the RAM startup. and rom vectors can 
> probably get away with being at 0x10000. Finally the data section should 
> be at something like 0x8000 for ROM startup.
> 
> Once you get it working, do please share your patches with us here on how 
> you made it work!
> 
> cd ecos/packages
> cvs -q diff -u5 -p > snds.patch
> 
> would make something appropriate if you attach snds.patch to your mail.
> 
> Jifl
> 
>