ARM Beagleboard: Difference between revisions
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Append:
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deb http://www.emdebian.org/debian/ squeeze main
</syntaxhighlight>
to your /etc/apt/sources.list, changing 'squeeze' for your version of Debian - I'm running wheezy, for example.
now run:
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sudo aptitude update
sudo aptitude install gcc-4.4-arm-linux-gnueabi # check this! it might be an older version for non-wheezy...
</syntaxhighlight>
That will install a C compiler, and also install Binutils, which for this tutorial is really all we need, but you may later wish to write your code in C.
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Take note of what it does. It's pretty simple. Refer to docs if necessary.
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/* rammap */
MEMORY
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.text : { *(.text*) } > ram
}
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===Makefile===
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This is the basic makefile I use. It's similar to the one on the stackoverflow link.
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ARMGNU = arm-linux-gnueabi
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$(ARMGNU)-objcopy boot.elf -O srec boot.srec
$(ARMGNU)-objcopy boot.elf -O binary boot.bin
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===Assembly!===
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====boot.asm====
<tt><
#UART base locations from the TRM
.equ UART1.BASE, 0x4806A000
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# (branch (jump, JMP) to _hang)
# b _hang
</
==='Compiling' it===
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You should see:
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U-Boot 2011.03-rc1-00000-g9a3cc57-dirty (Apr 04 2011 - 12:36:16)
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Die ID #2e7000029ff80000016842c813020023
Hit any key to stop autoboot: 3
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Hit a key. Before Linux loads.
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OMAP3 beagleboard.org #
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Whee, a u-boot prompt.
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Just type 'loady'. Don't worry about being fast on your first go, you'll miss it anyway.
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OMAP3 beagleboard.org # loady
## Ready for binary (ymodem) download to 0x80200000 at 115200 bps...
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Now hit Ctrl+A. A bar will appear at the bottom.
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After the file is loaded into RAM,
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READY: Press any key.
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and
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Cm - CRC mode, 9(SOH)/0(STX)/0(CAN) packets, 3 retries
## Total Size = 0x00000350 = 848 Bytes
OMAP3 beagleboard.org #
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is printed (my file is bigger... don't worry about that), we just have to execute the code in memory!
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Execution is started from an address with 'go'. Our _start address is 0x80200000. So, we type:
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OMAP3 beagleboard.org # go 0x80200000
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and we should get:
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## Starting application at 0x80200000 ...
!
</syntaxhighlight>
If you get that, congratulations! You've just written an 'Operating' System (;)) for the BeagleBoard! The process will seem long winded at first, but it's not really at all.
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