[PATCH] doc: add list of environment variables used by cnxk

[Nithin Dabilpuram <ndabilpuram@marvell.com>]

Add list of environment variables used by cnxk drivers.

Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
---
 doc/guides/platform/cnxk.rst | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/doc/guides/platform/cnxk.rst b/doc/guides/platform/cnxk.rst
index 423b3d7..97b2be5 100644
--- a/doc/guides/platform/cnxk.rst
+++ b/doc/guides/platform/cnxk.rst
@@ -620,3 +620,18 @@ CN10K:
    if Marvell toolchain is available then it can be used by overriding the
    c, cpp, ar, strip ``binaries`` attributes to respective Marvell
    toolchain binaries in ``config/arm/arm64_cn10k_linux_gcc`` file.
+
+Environment Variables
+~~~~~~~~~~~~~~~~~~~~~
+
+* ``BPHY_INTR_MLOCK_DISABLE``
+   When defined disables memory locking in
+   BPHY environment.
+
+* ``ROC_CN10K_MBOX_TIMEOUT``, ``ROC_MBOX_TIMEOUT``
+   When set, overrides MBOX timeout by value in milli seconds.
+
+* ``ETH_SEC_IV_OVR``
+   When set, overrides outbound inline SA IV. By default IV is generated
+   by HW. Format of variable is string of comma separated one byte values as
+   for ex: "0x0, 0x10, 0x20, ..."
-- 
2.8.4