From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kerl, John Date: Wed, 14 Jan 2004 09:35:14 -0700 Subject: [U-Boot-Users] Statically assigned IP addresses Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de > > understanding of U-boot: In our firmware, Ethernet is enabled > > at start-up, and we always answer pings. (And you do not need > > interrupts to do that -- our firmware runs polled and handles > > pings just fine.) I am in the habit of thinking that if a node > > That means you have to implement some kind of multitasking. or how > do you poll the network interface while another command is running? Actually our firmware is strictly polled, and uses no interrupts, tasks, etc. That keeps the code simple and reduces the porting time, since almost nothing needs to be written in assembler. It simply polls each device round-robin. If the UART has a character ready, it's appended to a buffer and the UART poll routine returns. If that character is the carriage return, another periodically called function sees that and calls the handle-input-line routine, which takes as long as needed, then returns. If the Ethernet poll routine sees a frame ready, it calls the appropriate function ARP/IP handler. Etc. In particular, we don't handle incoming packets while running a memory test, while committing an image to flash, etc. -- which is OK because the board is busy and is meant to be interacted with by a user. > > * There appears to be no way to use TFTP to copy data > > from the board to the PC. > > Please feel free to add a TFTP upload command. I think that would be a good idea. I find that this proves a handy way to copy a configured image (or a whole range of images, or the entire flash, etc.) to the PC for analysis and/or re-use. Something like tftpput flashimage.bin ffc00000,200000 to put 2 MB starting at 0xffc00000 to a file on the PC. I'm not yet familiar with the U-boot source, but I do know from my own code that the put and get are quite symmetrical, so it should be rather easy for me to make this change.