aica: Add note about minimum kernel version

Version 4.17 is the first one to have the deblobbing changes in it to
load the firmware.

diff --git a/aica/Dreamcast_sound.txt b/aica/Dreamcast_sound.txt
index 08c3bacc6d44d31dab2a5886401770b8491b4a7d..df8300623048e2c059f9633fe777c6c4027ecfe9 100644 (file)
--- a/aica/Dreamcast_sound.txt
+++ b/aica/Dreamcast_sound.txt
@@ -15,3 +15,6 @@ not playback any sound.
 
 The firmware, by default, should be loaded to /lib/firmware/ and should
 be named aica_firmware.bin.
+
+To use the firmware you will need at least Linux-libre version 4.17. 
+Earlier versions don't include the appropriate deblobbing changes.
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