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<?xml version="1.0" encoding="UTF-8"?>
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<h1>GXemul: Raspberry Pi emulation</h1>
<p>
<a href="./">Back to the index.</a>
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<p>The Raspberry Pi emulation is not working yet. This page
contains preliminary instructions for how to start debugging NetBSD,
FreeBSD, or HelenOS.</p>
<p><br>
<a name="netbsdrpi"></a>
<h3>NetBSD/raspberrypi:</h3>
<p><font color="red">This doesn't work yet.</font>
<p>Starting point for development:
<p>See <a href="http://wiki.netbsd.org/ports/evbarm/raspberry_pi/">http://wiki.netbsd.org/ports/evbarm/raspberry_pi/</a> for more info on NetBSD.
<p>To start debugging/development:
<ol>
<li>Download something similar to:<pre>
http://nyftp.netbsd.org/pub/NetBSD-daily/HEAD/201310032210Z/evbarm/binary/kernel/netbsd-RPI.gz
</pre>
<li><tt><b>gxemul -tviK -E rpi netbsd-RPI.gz</b></tt>
</pre>
</ol>
<p>TODO: Everything.
<pre>
GXemul> u
<kernel_text>
c00081e0: e10f1000 mrs r1,CPSR
c00081e4: e166f001 msr SPSR_sx,r1
c00081e8: e28f1048 add r1,pc,#0x48
c00081ec: e8912106 ldmia r1,{r1,r2,r8,sp}
c00081f0: ee0d8f90 mcr 15,0,r8,cr13,cr0,4
It starts up in kernel_text, which is in NetBSD usr/src/sys/arch/arm/arm32/locore.S:
ENTRY_NP(kernel_text)
ASENTRY_NP(start)
mrs r1, cpsr /* fetch CPSR value */
msr spsr_sx, r1 /* set SPSR[23:8] to known value */
adr r1, .Lstart
ldmia r1, {r1, r2, r8, sp} /* Set initial stack and */
#if defined(TPIDRPRW_IS_CURCPU) || defined(TPIDRPRW_IS_CURLWP)
mcr p15, 0, r8, c13, c0, 4
#endif
#if defined(TPIDRPRW_IS_CURLWP)
ldr r8, [r8, #L_CPU] /* r8 needs curcpu in it */
#endif
mov r4, #0
#ifdef _ARM_ARCH_DWORD_OK
mov r5, #0
#endif
</pre>
<p>
Also useful for testing:
<pre>https://github.com/raspberrypi/firmware/blob/master/boot/kernel.img
<b>gxemul -tvK -E rpi 0x00000000:kernel.img</b>
</pre>
<p><br>
<a name="freebsdrpi"></a>
<h3>FreeBSD:</h3>
<p><font color="red">Dummy mode so far.</font>
<p>FreeBSD sd card image:
<pre>
http://www.db.net/downloads/bsd-pi-250580M.img.xz
# Extract the kernel from the second (2) slice' first partition (a):
mdconfig -a -t vnode -f bsd-pi-250580M.img
mount /dev/md0s2a /mnt/
cp /mnt/boot/kernel/kernel* .
umount /mnt
mdconfig -d -u 0
<b>gxemul -tK -E rpi kernel</b>
</pre>
</p>
<p><br>
<a name="helenosrpi"></a>
<h3>HelenOS/rpi:</h3>
<p><font color="red">The Raspberry Pi mode in GXemul is just a dummy so far.</font>
<p>These instructions are used as a reminder for me when I wish
to experiment with the HelenOS kernel:
<p>
<ol>
<li>Download the HelenOS kernel:<pre>
<a href="http://www.helenos.org/releases/HelenOS-0.7.2-arm32-raspberrypi.bin">http://www.helenos.org/releases/HelenOS-0.7.2-arm32-raspberrypi.bin</a>
</pre>
<li>Start GXemul using the following command line:<pre>
<b>gxemul -VE rpi -tv 0x8000:0x40:0x8000:HelenOS-0.7.2-arm32-raspberrypi.bin</b>
</pre>
</ol>
<p><br>
</body>
</html>
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