Convenience script for ZMODEM upload

Change-Id: I1d84554f813106a3aaed1567d6e591ba559e3e54

install-prereqs.sh

diff --git a/install-prereqs.sh b/install-prereqs.sh
index 6f92368..6da5bb5 100755
--- a/install-prereqs.sh
+++ b/install-prereqs.sh
@@ -62,6 +62,7 @@
     ninja-build
     perl
     protobuf-compiler
+    pv
     python-dev
     python3-protobuf
     python3

kupload.sh

diff --git a/kupload.sh b/kupload.sh
new file mode 100755
index 0000000..fdf44d6
--- /dev/null
+++ b/kupload.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+# ZMODEM upload to the Kata rz command over the pty simulating the UART
+#
+# sz is "send ZMODEM", while pv, "pipe viewer" is used for rate limiting.
+#
+# Severe rate limiting is needed to avoid the Renode UART simulation dropping
+# bytes when the RX FIFO is full, since it doesn't provide "hardware" flow
+# control.
+
+sz -O $1 < /tmp/term | pv -L 150 > /tmp/term