From mboxrd@z Thu Jan 1 00:00:00 1970 From: shuwn yuan Date: Tue, 7 Mar 2006 18:13:43 -0800 (PST) Subject: [U-Boot-Users] AT91RM9100 board with uCOS-II. What boot loader to use? In-Reply-To: <3259661.post@talk.nabble.com> References: <3259661.post@talk.nabble.com> Message-ID: <3293578.post@talk.nabble.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de hi all, Let me explain more about my case. I know that U-boot is OS-independant bootloader. If I change to uCOS-II instead of ARM-linux, I can still use U-boot as bootloader for AT91RM9200. Am I right? But I know some modification has to be done on the original U-boot for the ARM-linux version. Address mapping (Flash & RAM) for my AT91RM9200 board ==================================== 0x20000000 = RAM 0x10000000 = parallel flash 0x10000000 = Boot.bin 0x10010000 = u-boot.gz 0x10020000 = zImage (ARM-linux kernel) 0xc0000000 = serial flash 0xc0000000 = Ramdisk.gz (ARM-linux file system) Currently, for my ARM-linux version, the "bootcmd" for auto-boot is set as follow: "bootcmd=cp 10020000 20008000 e0000;cp c0000000 21000000 100000;go 20008000" It copy kernel image "zImage" which store at 0x10020000 (size = 0xe0000) to 0x20008000 (RAM); copy file system image "Ramdisk.gz" which store at 0xc0000000 (size = 0x100000) to 0x21000000 (RAM); jump to RAM location 0x20008000 Now I change to uCOS-ii as OS, & reprogram parallel flash content as follow: 0x10000000 - Boot.bin 0x10010000 - u-boot.gz 0x10020000 - (uCOS-II + application) binary For the U-boot, is it just change the environment variable "bootcmd" to this? "bootcmd=cp 10020000 20008000 f818;go 20008000" It means copy the (ucos-ii + application) binary (size = 0xf818) from 0x10020000 to 0x200080000 (RAM); go to RAM location 0x20008000. Is this all I need to do? But I try to change the "bootcmp" in U-boot prompt, using this cmd: Uboot> setenv bootcmd cp 10020000 20008000 f818;go 20008000 But this seems not work. I can't set it successfully. It directly jump to RAM location 0x20008000 after this & I can't save the "bootcmd". I expect it to be still in U-boot prompt after I type the above, & then I should type: U-boot> saveenv to save the "bootcmd" variable. How to set the "bootcmd" in U-boot? How to put more than 1 action in "bootcmd" (eg: cp .....; go.....)? Does it not allow to type ";" ? What punctuation mark should I use? Is changing the "bootcmd" enough if change to uCOS-II? Or I need to modify U-boot source code, recompile, & reprogram the u-boot.gz into parallel flash? Any reference link online suggested? Please help. Thanks :-) -- View this message in context: http://www.nabble.com/AT91RM9100-board-with-uCOS-II.-What-boot-loader-to-use--t1232449.html#a3293578 Sent from the Uboot - Users forum at Nabble.com.