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-rw-r--r--docs/system/ppc/amigang.rst17
-rw-r--r--docs/system/ppc/embedded.rst1
-rw-r--r--docs/system/ppc/powernv.rst7
3 files changed, 16 insertions, 9 deletions
diff --git a/docs/system/ppc/amigang.rst b/docs/system/ppc/amigang.rst
index e2c9cb74b7..21bb14ed09 100644
--- a/docs/system/ppc/amigang.rst
+++ b/docs/system/ppc/amigang.rst
@@ -21,6 +21,7 @@ Emulated devices
  * VIA VT82C686B south bridge
  * PCI VGA compatible card (guests may need other card instead)
  * PS/2 keyboard and mouse
+ * 4 KiB NVRAM (use ``-drive if=mtd,format=raw,file=nvram.bin`` to keep contents persistent)
 
 Firmware
 --------
@@ -54,14 +55,14 @@ To boot the system run:
                     -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. The ``ati-vga`` RV100 emulation is not
-complete yet so only frame buffer works, DRM and 3D is not available.
+If a firmware menu 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. The ``ati-vga`` RV100
+emulation is not complete yet so only frame buffer works, DRM and 3D is not
+available.
 
 Genesi/bPlan Pegasos II (``pegasos2``)
 ======================================
diff --git a/docs/system/ppc/embedded.rst b/docs/system/ppc/embedded.rst
index af3b3d9fa4..5cb7d98b45 100644
--- a/docs/system/ppc/embedded.rst
+++ b/docs/system/ppc/embedded.rst
@@ -4,6 +4,5 @@ Embedded family boards
 - ``bamboo``               bamboo
 - ``mpc8544ds``            mpc8544ds
 - ``ppce500``              generic paravirt e500 platform
-- ``ref405ep``             ref405ep
 - ``sam460ex``             aCube Sam460ex
 - ``virtex-ml507``         Xilinx Virtex ML507 reference design
diff --git a/docs/system/ppc/powernv.rst b/docs/system/ppc/powernv.rst
index de7a807ac7..f3ec2cc69c 100644
--- a/docs/system/ppc/powernv.rst
+++ b/docs/system/ppc/powernv.rst
@@ -195,6 +195,13 @@ Use a MTD drive to add a PNOR to the machine, and get a NVRAM :
 
   -drive file=./witherspoon.pnor,format=raw,if=mtd
 
+If no mtd drive is provided, the powernv platform will create a default
+PNOR device using a tiny formatted PNOR in pc-bios/pnv-pnor.bin opened
+read-only (PNOR changes will be persistent across reboots but not across
+invocations of QEMU). If no defaults are used, an erased 128MB PNOR is
+provided (which skiboot will probably not recognize since it is not
+formatted).
+
 Maintainer contact information
 ------------------------------