firmware loader: introduce module parameter to customize(v4) fw search path

[profile/ivi/kernel-adaptation-intel-automotive.git] / Documentation / firmware_class / README

diff --git a/Documentation/firmware_class/README b/Documentation/firmware_class/README
index 815b711..e9fce78 100644 (file)
--- a/Documentation/firmware_class/README
+++ b/Documentation/firmware_class/README
@@ -22,12 +22,17 @@
        - calls request_firmware(&fw_entry, $FIRMWARE, device)
        - kernel searchs the fimware image with name $FIRMWARE directly
        in the below search path of root filesystem:
+               User customized search path by module parameter 'path'[1]
                "/lib/firmware/updates/" UTS_RELEASE,
                "/lib/firmware/updates",
                "/lib/firmware/" UTS_RELEASE,
                "/lib/firmware"
        - If found, goto 7), else goto 2)
 
+       [1], the 'path' is a string parameter which length should be less
+       than 256, user should pass 'firmware_class.path=$CUSTOMIZED_PATH'
+       if firmware_class is built in kernel(the general situation)
+
  2), userspace:
        - /sys/class/firmware/xxx/{loading,data} appear.
        - hotplug gets called with a firmware identifier in $FIRMWARE