hw/arm/aspeed: Fix location of firmware images in documentation

Firmware images can be found on the OpenBMC jenkins site and on the
OpenBMC GitHub release page.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Message-Id: <20210303072743.1551329-1-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

docs/system/arm/aspeed.rst

@@ -72,18 +72,22 @@ Missing devices
 Boot options
 ------------
 
-The Aspeed machines can be started using the -kernel option to load a
-Linux kernel or from a firmware image which can be downloaded from the
-OpenPOWER jenkins :
+The Aspeed machines can be started using the ``-kernel`` option to
+load a Linux kernel or from a firmware. Images can be downloaded from
+the OpenBMC jenkins :
 
-   https://openpower.xyz/
+   https://jenkins.openbmc.org/job/ci-openbmc/lastSuccessfulBuild/distro=ubuntu,label=docker-builder
+
+or directly from the OpenBMC GitHub release repository :
+
+   https://github.com/openbmc/openbmc/releases
 
 The image should be attached as an MTD drive. Run :
 
 .. code-block:: bash
 
   $ qemu-system-arm -M romulus-bmc -nic user \
-	-drive file=flash-romulus,format=raw,if=mtd -nographic
+	-drive file=obmc-phosphor-image-romulus.static.mtd,format=raw,if=mtd -nographic
 
 Options specific to Aspeed machines are :