hw/arm/aspeed: Add machine properties to define the flash models

Some machines don't have much differences a part from the flash model
being used. Introduce new machine properties to change them from the
command line.

For instance, to start the ast2500-evb machine with a different FMC
chip and a 64M SPI chip, use :

  -M ast2500-evb,fmc-model=mx25l25635e,spi-model=mx66u51235f

Cc: 郁雷 <yulei.sh@bytedance.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Tested-by: Lei YU <yulei.sh@bytedance.com>
Message-Id: <20200915054859.2338477-1-clg@kaod.org>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/docs/system/arm/aspeed.rst b/docs/system/arm/aspeed.rst
index 45f891eb3c..2d33d02345 100644
--- a/docs/system/arm/aspeed.rst
+++ b/docs/system/arm/aspeed.rst
@@ -83,3 +83,21 @@ The image should be attached as an MTD drive. Run :
 
   $ qemu-system-arm -M romulus-bmc -nic user \
 	-drive file=flash-romulus,format=raw,if=mtd -nographic
+
+Options specific to Aspeed machines are :
+
+ * ``execute-in-place`` which emulates the boot from the CE0 flash
+   device by using the FMC controller to load the instructions, and
+   not simply from RAM. This takes a little longer.
+
+ * ``fmc-model`` to change the FMC Flash model. FW needs support for
+   the chip model to boot.
+
+ * ``spi-model`` to change the SPI Flash model.
+
+For instance, to start the ``ast2500-evb`` machine with a different
+FMC chip and a bigger (64M) SPI chip, use :
+
+.. code-block:: bash
+
+  -M ast2500-evb,fmc-model=mx25l25635e,spi-model=mx66u51235f