Difference between revisions of "EBC Exercise 25 Configuring U-boot"
(→bitbake: Updated for 2011) |
m (→Compiling U-boot) |
||
(16 intermediate revisions by 3 users not shown) | |||
Line 1: | Line 1: | ||
[[Category:ECE497]] | [[Category:ECE497]] | ||
[[Category:BeagleBoard]] | [[Category:BeagleBoard]] | ||
+ | {{YoderHead}} | ||
− | + | In [[EBC_Exercise_08_Installing_Development_Tools#DAS_U-boot]] you learned how to download, compile and run U-boot, here we'll configure it. | |
− | == | + | == Compiling U-boot == |
− | + | You can now compile U-boot. | |
− | |||
− | |||
− | |||
− | |||
− | You | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | + | host$ '''source ~/crossCompileEnv.sh''' | |
+ | host$ '''make''' | ||
+ | host$ '''scp u-boot.bin root@beagle:.''' | ||
− | == | + | On the beagle, first be sure the FAT partition is mounted |
+ | beagle$ '''cd /media/''' | ||
+ | beagle$ '''mkdir mmcblk0p1''' | ||
+ | beagle$ '''mount /dev/mmcblk0p1 mmcblk0p1/''' | ||
+ | beagle$ '''cd mmcblk0p1/''' | ||
+ | beagle$ '''ls -ls''' | ||
+ | total 354 | ||
+ | 2 drwxr-xr-x 4 root root 2048 May 16 15:29 Docs | ||
+ | 2 drwxr-xr-x 5 root root 2048 May 16 15:29 Drivers | ||
+ | 6 -rwxr-xr-x 1 root root 5829 Aug 14 10:10 LICENSE.txt | ||
+ | 84 -rwxr-xr-x 1 root root 85058 Aug 14 08:19 MLO | ||
+ | 14 -rwxr-xr-x 1 root root 13976 Aug 14 10:10 README.htm | ||
+ | 2 -rwxr-xr-x 1 root root 27 Aug 14 10:23 Uenv.txt | ||
+ | 2 -rwxr-xr-x 1 root root 178 Aug 14 10:10 autorun.inf | ||
+ | 2 -rwxr-xr-x 1 root root 171 Aug 14 10:10 info.txt | ||
+ | 238 -rwxr-xr-x 1 root root 241948 Aug 14 08:19 u-boot.img | ||
+ | 2 -rwxr-xr-x 1 root root 33 Aug 14 10:23 uEnv.txt.orig | ||
+ | |||
+ | Make a backup of the original u-boot. | ||
+ | beagle$ '''cp u-boot.bin u-boot.bin.orig''' | ||
+ | beagle$ '''cp ~/u-boot.bin .''' | ||
+ | beagle$ shutdown -r now | ||
+ | |||
+ | You should now be running the new u-boot. | ||
+ | |||
+ | == <span style="color:green">Assignment</span> == | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | + | # Modify u-boot to include your initials in the prompt. (Hint: Look for the '''omap3_beagle.h''' file for the xM or '''am335x_evm.h''' for the bone.) | |
− | + | # Learn what is done when the '''boot''' command is entered in u-boot. | |
− | + | # Find where the code for boot is defined in the u-boot source. | |
− | |||
− | |||
− | |||
− | |||
− | |||
− | + | Hint: | |
+ | u-boot# '''help boot''' | ||
+ | boot - boot default, i.e., run 'bootcmd' | ||
+ | |||
+ | Usage: | ||
+ | boot | ||
+ | u-boot# '''print bootcmd''' | ||
+ | bootcmd=if mmc rescan ${mmcdev}; then if userbutton; then setenv bootenv user.txt;fi;echo SD/MMC found on device ${mmcdev};if run loadbootenv; then echo Loaded environment from ${bootenv};run importbootenv;fi;if test -n $uenvcmd; then echo Running uenvcmd ...;run uenvcmd;fi;if run loaduimage; then run mmcboot;fi;fi;run nandboot; | ||
− | + | {{YoderFoot}} |
Latest revision as of 10:19, 3 June 2013
Embedded Linux Class by Mark A. Yoder
In EBC_Exercise_08_Installing_Development_Tools#DAS_U-boot you learned how to download, compile and run U-boot, here we'll configure it.
Compiling U-boot
You can now compile U-boot.
host$ source ~/crossCompileEnv.sh host$ make host$ scp u-boot.bin root@beagle:.
On the beagle, first be sure the FAT partition is mounted
beagle$ cd /media/ beagle$ mkdir mmcblk0p1 beagle$ mount /dev/mmcblk0p1 mmcblk0p1/ beagle$ cd mmcblk0p1/ beagle$ ls -ls total 354 2 drwxr-xr-x 4 root root 2048 May 16 15:29 Docs 2 drwxr-xr-x 5 root root 2048 May 16 15:29 Drivers 6 -rwxr-xr-x 1 root root 5829 Aug 14 10:10 LICENSE.txt 84 -rwxr-xr-x 1 root root 85058 Aug 14 08:19 MLO 14 -rwxr-xr-x 1 root root 13976 Aug 14 10:10 README.htm 2 -rwxr-xr-x 1 root root 27 Aug 14 10:23 Uenv.txt 2 -rwxr-xr-x 1 root root 178 Aug 14 10:10 autorun.inf 2 -rwxr-xr-x 1 root root 171 Aug 14 10:10 info.txt 238 -rwxr-xr-x 1 root root 241948 Aug 14 08:19 u-boot.img 2 -rwxr-xr-x 1 root root 33 Aug 14 10:23 uEnv.txt.orig
Make a backup of the original u-boot.
beagle$ cp u-boot.bin u-boot.bin.orig beagle$ cp ~/u-boot.bin . beagle$ shutdown -r now
You should now be running the new u-boot.
Assignment
- Modify u-boot to include your initials in the prompt. (Hint: Look for the omap3_beagle.h file for the xM or am335x_evm.h for the bone.)
- Learn what is done when the boot command is entered in u-boot.
- Find where the code for boot is defined in the u-boot source.
Hint:
u-boot# help boot boot - boot default, i.e., run 'bootcmd' Usage: boot u-boot# print bootcmd bootcmd=if mmc rescan ${mmcdev}; then if userbutton; then setenv bootenv user.txt;fi;echo SD/MMC found on device ${mmcdev};if run loadbootenv; then echo Loaded environment from ${bootenv};run importbootenv;fi;if test -n $uenvcmd; then echo Running uenvcmd ...;run uenvcmd;fi;if run loaduimage; then run mmcboot;fi;fi;run nandboot;
Embedded Linux Class by Mark A. Yoder