Start linux from flash at startup The boot loader can be set up to automatically start Linux at power up. Do the following: To load kernel image into RAM on mb1100 type: load Then the image has to be copied to FLASH. Erase block in FLASH: erase bfd00000 2c0000 Copy image from RAM to FLASH: copy a0100000 bfd00000 2c0000 When YAMON starts up it will process the start command, so that has to be set up. The kernel_entry address is not fixed so the start address has to be set up for each new kernel image. The start address can be read from the srec image file or it is printed on the screen after the load image command. To set the start command: set start 'copy bfd00000 a0100000 2c0000; go a032b018 \ root=/dev/mtdblock0 rootfstype=jffs2' Start Linux with root file system mounted as jffs2 In a real world the root file system will normally be located in the FLASH memory as a jffs2 partition. We will now copy a jffs2 image with the root file system to the FLASH. >From YAMON prompt do following: Fill 16 MB of RAM with FF: fill a1000000 1000000 ff Load image into RAM: load tftp://192.168.21.33/rootfs.srec Erase 16MB in FLASH: erase be000000 1000000 Copy 4MB from RAM to FLASH copy a1000000 be000000 400000 If the image is bigger than 4MB please copy the appropriate size. Now it should be ready to press reset. If it prints a lot of text Linux starts correctly If it prints ?kernel panic? in the end then it failed to mount the root file system This is based on a CPU module mb1100 that is similar to db1100. More information about au1100 running Linux can be found at http://www.mechatronicbrick.dk Kind regards Jorg
