[U-Boot-Users] AT91RM9100 board with uCOS-II. What boot loader to use?
hi all,
I bought a AT91RM9200 development board. It comes with ARM-Linux as OS. The boot loader (in parallel flash) used is boot.bin & u-boot.bin.
If I change the OS to uCOS-II, can I still use boot.bin & u-boot.bin as boot loader?
If yes, any modification need to be done on boot.bin & u-boot.bin? Have to get the source code to modify & compile again? May I know what to modify?
Is boot.bin & u-boot.bin only meant for AT91RM9200 board with embedded Linux as OS?
Can anyone plx help? 10q :-)
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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 :-)
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On onsdag 08 mars 2006 03.13, shuwn yuan wrote:
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".
Your command is seen as two commands:
setenv bootcmd cp 10020000 20008000 f818
followed by
go 20008000
You need to escape the semicolon ';' see http://www.denx.de/wiki/view/DULG/UBootCmdGroupEnvironment#Section_5.9.6.3.
/RogerL
Dear shuwn yuan!
shuwn yuan schrieb:
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?
You have to use a backslash as escape character, so the line becomes setenv bootcmd cp 10020000 20008000 f818;go 20008000
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?
You probably want to set the default environment to boot uCOS-II, so you have to change some settings in your board configuration file in include/configs .
With best regards Andreas Schweigstill
participants (3)
-
Andreas Schweigstill -
Roger Larsson -
shuwn yuan