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-rw-r--r--Documentation/admin-guide/kernel-parameters.txt7
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 9e5bab29685f..911c54829c7c 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5452,7 +5452,12 @@
port and the regular usb controller gets disabled.
root= [KNL] Root filesystem
- See name_to_dev_t comment in init/do_mounts.c.
+ Usually this a a block device specifier of some kind,
+ see the early_lookup_bdev comment in
+ block/early-lookup.c for details.
+ Alternatively this can be "ram" for the legacy initial
+ ramdisk, "nfs" and "cifs" for root on a network file
+ system, or "mtd" and "ubi" for mounting from raw flash.
rootdelay= [KNL] Delay (in seconds) to pause before attempting to
mount the root filesystem