change log for rtems (2011-07-18)

rtems-vc at rtems-vc at
Mon Jul 18 18:11:21 UTC 2011

2011-07-18  Till Straumann <strauman at>

	* README.qemu: added.

M  1.165  c/src/lib/libbsp/powerpc/motorola_powerpc/ChangeLog
A    1.1  c/src/lib/libbsp/powerpc/motorola_powerpc/README.qemu

diff -u rtems/c/src/lib/libbsp/powerpc/motorola_powerpc/ChangeLog:1.164 rtems/c/src/lib/libbsp/powerpc/motorola_powerpc/ChangeLog:1.165
--- rtems/c/src/lib/libbsp/powerpc/motorola_powerpc/ChangeLog:1.164	Mon Jul 18 11:32:29 2011
+++ rtems/c/src/lib/libbsp/powerpc/motorola_powerpc/ChangeLog	Mon Jul 18 12:40:55 2011
@@ -1,16 +1,17 @@
 2011-07-18  Till Straumann <strauman at>
-	* motorola_powerpc/make/custom/qemuprep-altivec.cfg,
-	motorola_powerpc/ added altivec-enabled variant.
+	* README.qemu: added.
+2011-07-18  Till Straumann <strauman at>
+	* make/custom/qemuprep-altivec.cfg,
+	added altivec-enabled variant 'qemuprep-altivec'.
 2011-07-15  Till Straumann <strauman at>
-	* motorola_powerpc/,
-	motorola_powerpc/, motorola_powerpc/,
-	motorola_powerpc/include/bsp.h, motorola_powerpc/make/custom/qemuprep.cfg,
-	motorola_powerpc/qemu_fakerom/,
-	motorola_powerpc/qemu_fakerom/.cvsignore:
-	Added 'qemuprep' BSP variant.
+	*,,, include/bsp.h,
+	make/custom/qemuprep.cfg, qemu_fakerom/,
+	qemu_fakerom/.cvsignore: Added 'qemuprep' BSP variant.
 2011-06-18	Ralf Corsépius <ralf.corsepius at>

diff -u /dev/null rtems/c/src/lib/libbsp/powerpc/motorola_powerpc/README.qemu:1.1
--- /dev/null	Mon Jul 18 13:11:21 2011
+++ rtems/c/src/lib/libbsp/powerpc/motorola_powerpc/README.qemu	Mon Jul 18 12:40:55 2011
@@ -0,0 +1,119 @@
+The 'qemuprep'/'qemuprep-altivec' BSPs are variants of
+'motorola_powerpc' that can run under QEMU. They are *not*
+binary compatible with other variants of 'motorola_powerpc'
+(nor with each other).
+Most significant differences to real hardware:
+ - no OpenPIC, just a 8259 PIC (even though qemu implements an openpic
+   at least to some extent it is not configured into the prep platform
+   as of qemu-0.14.1).
+ - no VME (absense of the VME controller is detected by the BSP)
+ - the only network chip supported by both, qemu and vanilla RTEMS
+   is the ISA NE2000 controller. Note that the default interrupt line
+   settings used by RTEMS and QEMU differ: RTEMS uses 5 and QEMU 9.
+   This can be addressed by passing a RTEMS commandline option
+   --ne2k-irq=9.
+   Other controllers (i8559, e1000, pcnet) implemented by qemu can
+   also be used but require unbundled RTEMS drivers (libbsdport).
+   Note that the bundled 'if_fxp' has not been ported to PPC and works
+   on x86 only.
+ - unlike a real motorola board you can run qemu emulating a 7400 CPU
+   which features altivec. I.e., you can use this BSP (altivec-enabled
+   variant) to test altivec-enabled code.
+Compatibility: qemu had quite a few bugs related to the PREP platform.
+Version 0.12.4, for example, required patches. 0.14.1 seems to have
+fixed the show-stoppers. Hence, you *need* at least qemu-0.14.1 for
+this BSP; it should work without the need for patching QEMU.
+BIOS: qemu requires you to use a BIOS. The one that came with qemu
+0.12.4 didn't work for me so I created a minimal dummy that provides
+enough functionality for the RTEMS bootloader to work.
+BSP Variants:
+You can compile the BSP for either a 604 CPU or a 7400 (altivec-enabled).
+Note that you cannot run the altivec-enabled BSP variant on a CPU w/o
+altivec/SIMD hardware. The non-altivec variant is called 'qemuprep'
+and the altivec-enabled one 'qemuprep-altivec'. Hence, you can
+configure RTEMS:
+604/non-altivec variant only:
+  configure --target=powerpc-rtems --enable-rtemsbsp=qemuprep
+7400/altivec variant only:
+  configure --target=powerpc-rtems --enable-rtemsbsp=qemuprep-altivec
+both variants:
+  configure --target=powerpc-rtems --enable-rtemsbsp='qemuprep qemuprep-altivec'
+Building QEMU:
+In case you have no pre-built qemu-0.14.1 you can
+compile it yourself:
+cd qemu-0.14.1
+configure --target-list=ppc-softmmu
+Running QEMU:
+A number of command-line options are important (BTW: make sure
+you run the PPC/PREP emulator and not a natively installed i386/PC
+emulating 'qemu')
+-M prep         --- select machine type: prep
+-cpu 604        --- select 604 CPU for non-altivec variant
+-cpu 7400       --- select 7400 CPU for altivec variant
+              NOTE: the 7455 and 7457 emulations are buggy as of
+              qemu-0.14.1 and they won't work.
+-bios <rtems-install-prefix>/powerpc-rtems/qemuprep/qemu_fakerom.bin
+-bios <rtems-install-prefix>/powerpc-rtems/qemuprep-altivec/qemu_fakerom.bin
+                --- select proprietary dummy 'BIOS'
+-nographic      --- redirect serial/IO to console where qemu is run
+-kernel <path>  --- path to your RTEMS executable (.ralf file, e.g., 'hello.ralf')
+-no-reboot      --- terminate after one run
+-append <arg>   --- RTEMS kernel comand line (use e.g., to modify
+                    ne2000 driver interrupt line)
+(We assume your RTEMS application is correctly configured and
+built for networking using the ne2k adapter [other adapters 
+can be used with unbundled/libbsdport drivers])
+I use networking with a 'tap' interface on the host machine
+and can then communicate with the emulated target in any
+desired way.
+On (linux) host:
+# create a 'permanent' tap device that can be used by myself
+# (as non-root user).
+sudo tunctl -u `id -u`
+# configure tap0 interface
+sudo ifconfig tap0 netmask up
+# provide a suitable dhcpd config file (for the emulated
+# platform to boot: IP address etc.
+# execute dhcp on host
+sudo dhcpd -d tap0
+Start emulated prep platform:
+ppc-softmmu/qemu-system-ppc                               \
+    -M prep                                               \
+    -cpu 7400                                             \
+    -bios  <rtems-prefix>/powerpc-rtems/qemuprep-altivec/lib/qemu_fakerom.bin \
+    -kernel <my_path>/my_app.ralf                         \
+	-append --ne2k-irq=9                                  \
+    -nographic                                            \
+    -no-reboot                                            \
+    -net nic,model=ne2k_isa                               \
+    -net tap,vlan=0,ifname=tap0,script=no,downscript=no 
+Again: if you use the non-altivec BSP variant, use -cpu 604
+and if you use the altivec-enabled variant then you MUST use
+-cpu 7400.
+Have fun.
+Till Straumann, 2011/07/18


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