qemu-options.hx: document that tftp=dir is readonly

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1286
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/qemu-options.hx b/qemu-options.hx
index f7c83362d1d01fd7c8150db58f5b0574ad224bf9..aec23287361685e1b8cd0d45106eb1a7c587d142 100644 (file)
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -3100,6 +3100,8 @@ SRST
         server. The files in dir will be exposed as the root of a TFTP
         server. The TFTP client on the guest must be configured in
         binary mode (use the command ``bin`` of the Unix TFTP client).
+        The built-in TFTP server is read-only; it does not implement any
+        command for writing files. QEMU will not write to this directory.
 
     ``tftp-server-name=name``
         In BOOTP reply, broadcast name as the "TFTP server name"