Difference between revisions of "User:Collinjc"
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| 2-6 | | 2-6 | ||
| Initial Bootloader Serial Output | | Initial Bootloader Serial Output | ||
| − | | <pre> | + | | <pre>Texas Instruments X-Loader 1.4.2 (Feb 19 2009 - 12:01:24) |
| + | Reading boot sector | ||
| + | Loading u-boot.bin from mmc | ||
| + | |||
| + | |||
| + | U-Boot 2009.11-rc1 (Jan 08 2010 - 21:19:52) | ||
| + | OMAP3530-GP ES3.1, CPU-OPP2 L3-165MHz | ||
| + | OMAP3 Beagle board + LPDDR/NAND | ||
| + | I2C: ready | ||
| + | DRAM: 256 MB | ||
| + | NAND: 256 MiB | ||
| + | In: serial | ||
| + | Out: serial | ||
| + | Err: serial | ||
| + | Board revision C4 | ||
| + | Die ID #1e30000400000000040365fa1400400a | ||
| + | Hit any key to stop autoboot: 0 | ||
| + | OMAP3 beagleboard.org # | ||
</pre> | </pre> | ||
|- | |- | ||
| Line 106: | Line 123: | ||
| Hello Output for Host Computer | | Hello Output for Host Computer | ||
| <pre> | | <pre> | ||
| + | collinjc@collinjc-eee ~ % ./a.out [1021] | ||
| + | Hello, World! Main is executing at 0x80483e4 | ||
| + | This address (0xbfe6b58c) is in our stack frame | ||
| + | This address (0x804a020) is in our bss section | ||
| + | This address (0x804a014) is in our data section | ||
</pre> | </pre> | ||
|- | |- | ||
| Line 111: | Line 133: | ||
| 2-22 | | 2-22 | ||
| Hello Output for Beagle | | Hello Output for Beagle | ||
| − | | <pre> | + | | <pre>root@beagleboard:~# ./a.out |
| + | Hello, World! Main is executing at 0x8380 | ||
| + | This address (0xbea11cd4) is in our stack frame | ||
| + | This address (0x10670) is in our bss section | ||
| + | This address (0x10668) is in our data section | ||
</pre> | </pre> | ||
|} | |} | ||
Revision as of 19:01, 18 March 2010
I am majoring in computer engineering and pursuing a certificate in optical communications. I am currently enrolled in ECE597, hoping to explore the applications of Linux in an embedded environment as well as the necessary considerations that must be made in developing for such an environment. I have a keen interest and a great deal of experience with Linux and am a member of the Rose-Hulman Linux Users' Group.
I am currently working on a script to automate the bitbake process with multiple cores. This is a copy of the script in its current form. Please note that it is a work in progress.
#!/bin/sh
# bitbake automation
# J. Cody Collins
START=$(date +%s)
MAXTRIES=15
COUNT=1
export OETREE="${HOME}/oe"
echo "set environment variables"
. ${OETREE}/sourceme.txt
echo "Go to the OE tree"
cd ${OETREE}/openembedded
echo "Make sure it's up to date"
git pull --rebase
echo "Start building"
bitbake $1
while [ $? -ne 0 ]; do
if [ $COUNT -lt $MAXTRIES ]; then
((COUNT++))
echo "re-running bitbake -- trial $COUNT"
# Give the user a chance to kill the task
sleep 5
bitbake $1
else
echo "Maximum tries exceeded. Exiting..."
break
fi
done
END=$(date +%s)
DIFF=$(( $END - $START ))
echo "Build took $DIFF seconds."
echo "Completed after $COUNT attempts."
Listings
Chapter 2
| Number | Page | Caption | Listing |
|---|---|---|---|
| 2-1 | 2-6 | Initial Bootloader Serial Output | Texas Instruments X-Loader 1.4.2 (Feb 19 2009 - 12:01:24) Reading boot sector Loading u-boot.bin from mmc U-Boot 2009.11-rc1 (Jan 08 2010 - 21:19:52) OMAP3530-GP ES3.1, CPU-OPP2 L3-165MHz OMAP3 Beagle board + LPDDR/NAND I2C: ready DRAM: 256 MB NAND: 256 MiB In: serial Out: serial Err: serial Board revision C4 Die ID #1e30000400000000040365fa1400400a Hit any key to stop autoboot: 0 OMAP3 beagleboard.org # |
| 2-2 | 2-7 | Loading the Linux Kernel | |
| 2-3 | 2-9 | Linux Final Boot Messages | |
| 2-4 | 2-21 | Hello World, Embedded Style |
#include <stdio.h>
int bss_var; /* Uninitialized global variable */
int data_var = 1; /* Initialized global variable */
int main(int argc, char **argv)
{
void *stack_var; /* Local variable on the stack */
stack_var = (void *)main; /* Don't let the compiler */
/* optimize it out */
printf("Hello, World! Main is executing at %p\n", stack_var);
printf("This address (%p) is in our stack frame\n", &stack_var);
/* bss section contains uninitialized data */
printf("This address (%p) is in our bss section\n", &bss_var);
/* data section contains initializated data */
printf("This address (%p) is in our data section\n", &data_var);
return 0;
}
|
| 2-5 | 2-22 | Hello Output for Host Computer | collinjc@collinjc-eee ~ % ./a.out [1021] Hello, World! Main is executing at 0x80483e4 This address (0xbfe6b58c) is in our stack frame This address (0x804a020) is in our bss section This address (0x804a014) is in our data section |
| 2-5 | 2-22 | Hello Output for Beagle | root@beagleboard:~# ./a.out Hello, World! Main is executing at 0x8380 This address (0xbea11cd4) is in our stack frame This address (0x10670) is in our bss section This address (0x10668) is in our data section |
Chapter 4
| Number | Page | Caption | Listing |
|---|---|---|---|
| 4-1 | 4-7 | Kernel Build Output | |
| 4-2 | 4-9 | Link Stage: vmlinux | |
| 4-3 | 4-14 | Kernel Subdirectory | |
