docs: marvell: Add information into CLOCKSPRESET option how to identify CPU frequency
Signed-off-by: Pali Rohár <pali@kernel.org>
Change-Id: I5310c30051703bbf9f377762a00eb6a8188c6fa1
diff --git a/docs/plat/marvell/armada/build.rst b/docs/plat/marvell/armada/build.rst
index 2715f26..a4116cd 100644
--- a/docs/plat/marvell/armada/build.rst
+++ b/docs/plat/marvell/armada/build.rst
@@ -168,6 +168,13 @@
- CPU_1000_DDR_800 - CPU at 1000 MHz, DDR at 800 MHz
- CPU_1200_DDR_750 - CPU at 1200 MHz, DDR at 750 MHz
+ Look at Armada37x0 chip package marking on board to identify correct CPU frequency.
+ The last line on package marking (next line after the 88F37x0 line) should contain:
+
+ - C080 or I080 - chip with 800 MHz CPU - use ``CLOCKSPRESET=CPU_800_DDR_800``
+ - C100 or I100 - chip with 1000 MHz CPU - use ``CLOCKSPRESET=CPU_1000_DDR_800``
+ - C120 - chip with 1200 MHz CPU - use ``CLOCKSPRESET=CPU_1200_DDR_750``
+
- BOOTDEV
For Armada37x0 only, the flash boot device, default is ``SPINOR``.