[PATCH v3 21/21] docs: arm: xlnx-versal-virt: Add eMMC support documentation

[Sai Pavan Boddu]

Add details of eMMC specific machine property and example for passing
eMMC device.

Signed-off-by: Sai Pavan Boddu <sai.pavan.boddu@xilinx.com>
---
 docs/system/arm/xlnx-versal-virt.rst | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/docs/system/arm/xlnx-versal-virt.rst 
b/docs/system/arm/xlnx-versal-virt.rst
index 2602d0f..d1099fa 100644
--- a/docs/system/arm/xlnx-versal-virt.rst
+++ b/docs/system/arm/xlnx-versal-virt.rst
@@ -29,6 +29,7 @@ Implemented devices:
 - 2 GEMs (Cadence MACB Ethernet MACs)
 - 8 ADMA (Xilinx zDMA) channels
 - 2 SD Controllers
+    * SDHCI0 can be configured as eMMC
 - OCM (256KB of On Chip Memory)
 - DDR memory
 
@@ -43,6 +44,19 @@ Other differences between the hardware and the QEMU model:
 - QEMU provides 8 virtio-mmio virtio transports; these start at
   address ``0xa0000000`` and have IRQs from 111 and upwards.
 
+Enabling eMMC
+"""""""""""""
+In order to enable eMMC pass the following machine property "emmc=on".
+ex:
+    "-M xlnx-versal-virt,emmc=on"
+
+Above switch would configure SDHCI0 to accept eMMC. More details on eMMC
+emulation can be found in docs/devel/emmc.txt.
+
+Below is the command to pass eMMC device.
+    "-drive file=emmc.img,if=none,id=emmc,format=raw
+     -device emmc,drive=emmc,id=emmc0,bus=/sdhci0/sd-bus"
+
 Running
 """""""
 If the user provides an Operating System to be loaded, we expect users
-- 
2.7.4