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Re: [PATCH] docs/system: Document running Linux on amigaone machine


From: BALATON Zoltan
Subject: Re: [PATCH] docs/system: Document running Linux on amigaone machine
Date: Sat, 16 Dec 2023 13:53:55 +0100 (CET)

On Sat, 16 Dec 2023, Bernhard Beschow wrote:
Documentation on how to run Linux on the amigaone machine is currently burried
in the depths of the qemu-devel mailing list [1] and in the source code. Let's
collect the information in the QEMU handbook for a one stop solution.

Thanks for collecting this info and adding it as documentation. A few small comments bellow.

[1] 
https://lore.kernel.org/qemu-devel/dafc407d-3749-e6f4-3a66-750fde8965f9@eik.bme.hu/

Do we want to keep an URL in the commit log? kernel.org is quite stable but not sure it would need to be in the commit message.

Co-authored-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: Bernhard Beschow <shentey@gmail.com>
---
MAINTAINERS                  |  1 +
docs/system/ppc/amigaone.rst | 53 ++++++++++++++++++++++++++++++++++++
docs/system/target-ppc.rst   |  1 +
hw/ppc/amigaone.c            |  9 ------
4 files changed, 55 insertions(+), 9 deletions(-)
create mode 100644 docs/system/ppc/amigaone.rst

diff --git a/MAINTAINERS b/MAINTAINERS
index 695e0bd34f..a2dd1407e2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1560,6 +1560,7 @@ amigaone
M: BALATON Zoltan <balaton@eik.bme.hu>
L: qemu-ppc@nongnu.org
S: Maintained
+F: docs/system/ppc/amigaone.rst
F: hw/ppc/amigaone.c
F: hw/pci-host/articia.c
F: include/hw/pci-host/articia.h
diff --git a/docs/system/ppc/amigaone.rst b/docs/system/ppc/amigaone.rst
new file mode 100644
index 0000000000..c3f11a7bb2
--- /dev/null
+++ b/docs/system/ppc/amigaone.rst

Maybe call it amigang.rst so it can be a place for docs on other PPC AmigaNG machines such as pegasos2 and sam460ex in the future to collect them in one place.

@@ -0,0 +1,53 @@
+Eyetech AmigaOne/Mai Logic Teron (``amigaone``)
+===============================================
+
+The ``amigaone`` model emulates an AmigaOne XE mainboard developed by Eyetech. 
Use
+the executable ``qemu-system-ppc`` to simulate a complete system.

QEMU is not a simulator so even if that's repeating this should say emulate. (Should this doc be formatted with 80 chars line too like sources?)

+
+Emulated devices
+----------------
+
+ *  PowerPC 7457 v1.2 CPU
+ *  Articia S north bridge
+ *  VT82C686B south bridge
+ *  PCI VGA compatible card
+
+
+Preparation
+-----------
+
+A firmware binary is necessary for the boot process and is available at
+https://www.hyperion-entertainment.com/index.php/downloads?view=files&parent=28.
+It needs to be extracted with the following command:
+
+.. code-block:: bash
+
+  $ tail -c 524288 updater.image > u-boot-amigaone.bin
+
+The firmware binary is unable to run QEMU‘s standard vgabios and
+``VGABIOS-lgpl-latest.bin`` is needed instead. It can be downloaded from
+http://www.nongnu.org/vgabios.
+
+
+Running Linux
+-------------
+
+There are some Linux images under the following link that work on the
+``amigaone`` machine:
+https://sourceforge.net/projects/amigaone-linux/files/debian-installer/. To 
boot
+the system run:
+
+.. code-block:: bash
+
+  $ qemu-system-ppc -M amigaone -bios u-boot-amigaone.bin \
+                    -cdrom "A1 Linux Net Installer.iso" \
+                    -device ati-vga,model=rv100,romfile=VGABIOS-lgpl-latest.bin
+
+From the firmware menu that appears select ``Boot sequence`` →
+``Amiga Multiboot Options`` and set ``Boot device 1`` to
+``Onboard VIA IDE CDROM``. Then hit escape until the main screen appears again,
+hit escape once more and from the exit menu that appears select either
+``Save settings and exit`` or ``Use settings for this session only``. It may
+take a long time loading the kernel into memory but eventually it boots and the
+installer becomes visible.
diff --git a/docs/system/target-ppc.rst b/docs/system/target-ppc.rst
index 4f6eb93b17..c1daa463cf 100644
--- a/docs/system/target-ppc.rst
+++ b/docs/system/target-ppc.rst
@@ -18,6 +18,7 @@ help``.
   :maxdepth: 1

   ppc/embedded
+   ppc/amigaone
   ppc/powermac
   ppc/powernv
   ppc/ppce500
diff --git a/hw/ppc/amigaone.c b/hw/ppc/amigaone.c
index ddfa09457a..4f680a5bdd 100644
--- a/hw/ppc/amigaone.c
+++ b/hw/ppc/amigaone.c
@@ -27,15 +27,6 @@

#define BUS_FREQ_HZ 100000000

-/*
- * Firmware binary available at
- * 
https://www.hyperion-entertainment.com/index.php/downloads?view=files&parent=28
- * then "tail -c 524288 updater.image >u-boot-amigaone.bin"
- *
- * BIOS emulator in firmware cannot run QEMU vgabios and hangs on it, use
- * -device VGA,romfile=VGABIOS-lgpl-latest.bin
- * from http://www.nongnu.org/vgabios/ instead.
- */

Maybe it's worth keeping the comment here in case somebody reads the source but not documentation. Do you want to send a v2 or want me to take over and do it myself?

Regards,
BALATON Zoltan

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