README: add note about min kernel version

The min kernel version is v4.15 kernel because libnvme depends on the
/sys/class/nvme-subsystem interface.

Signed-off-by: Daniel Wagner <dwagner@suse.de>

diff --git a/README.md b/README.md
index 36616863bb9b0045f4af908f0fb5071db755df14..20623c1ca612ef01f8b30ab75918ee648ceeca99 100644 (file)
--- a/README.md
+++ b/README.md
@@ -256,3 +256,10 @@ normal git operations or the command:
 
     $ meson subprojects update
 
+## Dependency
+
+libnvme depends on the /sys/class/nvme-subsystem interface which was
+introduced in the Linux kernel release v4.15. Hence nvme-cli 2.x is
+only working on kernels >= v4.15. For older kernels nvme-cli 1.x is
+recommended to be used.
+