Background Info: working on porting linux kernel 2.6 to the DB1500 and Encore M3 board both of which are run on the AU1500 processor. Hi, Thanks Pete for your inputs. I changed the DB1500 board setting so that it is now Big Endian. Now when I load the image and issue the 'go' command in YAMON, I dont see anything happen. I cant stop the process by a control C. Where is the logbuf located where all the commands are dumped? I m also pasting here the output of the setenv command which shows me the environment variables and what they are set to. What are the bootargs meant to be set to? MAC (R/W) 0 bootargs0 (USER) ip=xxx.xxx.x.150::::db1500:eth0:off bootargs1 (USER) nfsroot=xxx.xxx.x.15:/usr/local/targets/mips-target bootargs2 (USER) root=ff noinitrd video=atyfb:1024x768-8@70 bootfile (R/W) vmlinux.srec bootprot (R/W) tftp bootserport (R/W) tty0 bootserver (R/W) xxx.xxx.x.8 ethaddr (R/W) xx.xx.xx.xx.xx.xx gateway (R/W) xxx.xxx.xx.1 ipaddr (R/W) xxx.xxx.x.146 memsize (RO) 0x04000000 modetty0 (RO) 115200,n,8,1,none modetty1 (RO) 115200,n,8,1,none prompt (R/W) YAMON start (R/W) load; go subnetmask (R/W) 255.255.255.0 I have another query about a different board - the Alchemy Encore M3 which has the same processor, AU1500, as the DB1500 above. The ENM3 has a VIA Southbridge on the PCI bus. The serial port on the Southbridge is connected to the board. Now I want to 'see' what is happening during the boot process, thus, want to see messages being output, through the serial port. A UART driver is thus no good. It has been suggested that I write a TLB entry during the initial booting process (eg. when the memory is mapped, timer interrupt is set up etc.) to route all the printk outputs to the serial port (which will be 'hardcoded'). However, I am really not sure how to do this! I m confused about this: - if this entry is written, what should point to the address in question? - should it just be one address or a chunk of addresses so that longer messages maybe printed? If this question doesnt make sense, then I think I m unclear on the actual process of what actually happens when the kernel comes into the picture. Are there any links that will help clarify the matter? I have already looked at http://www.linux-mips.org/wiki/Porting and http://linux.junsun.net/porting-howto/ I am reading the following books: 1) Understanding the Linux Kernel - for 2.4 kernel 2) Linux Device Drivers: again for the 2.4 kernel 3) Linux Kernel Development (kernel 2.6) Please shed some light on this cus I think I m just trying to make guesses in the dark! I really appreciate all the help I have gotten so far and thanks in advance for your replies. Regards, Ashlesha.
