[U-Boot] bootfile environment variable

[l3iggs .]

> Date: Sun, 1 Jun 2014 10:30:50 -0600
> Subject: Re: [U-Boot] bootfile environment variable
> From: sjg at chromium.org
> To: l3iggs at live.com
> CC: u-boot at lists.denx.de
> 
> Hi,
> 
> On 26 May 2014 21:05, l3iggs . <l3iggs at live.com> wrote:
> > Hello,I have a DHCP server set up to provide all of the environment variables listed at the bottom of this page: http://www.denx.de/wiki/view/DULG/UBootEnvVariablesSpecifically, I've configure my DHCP server to provide option #67, Bootfile name, as "zImage"u-boot picks up on this nicely and so when I run=> dhcpu-boot downloads zImage from my TFTP server. However, I've found it impossible to download any other file with this setup. For example, I expect that when I execute=> dhcp 0x120000000 192.168.1.1:zImage2or=> dhcp zImage2I should get the zImage2 file. Unfortunately, zImage is downloaded in all cases. I've been unable to find any command (DHCP, TFTP) that I can issue that will allow me to download any file other than the DHCP provided default file. Removing/disabling option #67 from my DHCP server solves the problem and u-boot can download any file I ask from my TFTP server.
> > I'm running commit 9665fa8f9e1488209d5e01d0792c243e0a220c5a
> > It seems like the proper behavior would be be that the DHCP provided file name is overridden by a file name given at the u-boot prompt and the DHCP provided file name is only downloaded when no file name is specified at the command line.
> > Can anyone else confirm this issue?
> 
> You can 'setenv autoload n' and then it will not load anything. You
> can then use the 'tftpboot' command to load what you want.
> 
> But for your case you can find the code in net/bootp.c. If you
> '#define DEBUG' at the top of that file you might get some clues.
> 
> It looks like this is supported, but there are strange server
> differences which you might be hitting. See for example line 779 of
> net/bootp.c below the comment '/* vendor opt bootfile */'.
> 
> Regards,
> Simon

Dear Simon,Thanks for wading through the poor formatting to answer my question. Your answer solved my problem.Best,l3iggs