Update fastbuild scripts.

fastbuild/buildesp

@@ -10,7 +10,13 @@ fi
 if [ $# -eq 1 ] && [ $1 = "--erase" ]
 then
     make clean
-    esptool.py  --port /dev/ttyUSB0 erase_flash
+    if esptool.py  --port /dev/ttyUSB0 erase_flash
+    then
+        echo Flash erased OK
+    else
+        echo Connection failure
+        exit 1
+    fi
 fi
 
 if make -j 8 FROZEN_MANIFEST=$MANIFEST

fastbuild/buildnew

@@ -4,7 +4,7 @@
 cd $MPDIR
 echo Working...
 git checkout master
-git pull origin master
+git pull origin master --tags
 git submodule update --init
 cd mpy-cross
 make clean

fastbuild/buildpyb

@@ -30,11 +30,16 @@ if [ $BOARD ]
 then
     echo Building for $BOARD
     cd $MPDIR/ports/stm32
+    if [ $# -eq 1 ] && [ $1 = "--minimal" ]
+    then
+        MANIFEST=$MANIFESTS/minimal_manifest.py
+        make BOARD=$BOARD clean
+    fi
     if [ $# -eq 1 ] && [ $1 = "--clean" ]
     then
         make BOARD=$BOARD clean
     fi
-    if make -j 8 BOARD=$BOARD FROZEN_MANIFEST=$MANIFEST && pyb_boot $MPDEVICE
+    if make -j 8 BOARD=$BOARD FROZEN_MANIFEST=$MANIFEST MICROPY_VFS_LFS2=1 && pyb_boot $MPDEVICE
     then
         sleep 1
         make PYTHON=python3 BOARD=$BOARD FROZEN_MANIFEST=$MANIFEST deploy

fastbuild/pyb_boot

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#! /usr/bin/env python
 
 # Called from buildpyb
 # Put pyboard into DFU mode.
@@ -6,14 +6,19 @@
 import sys
 import os
 mp = os.getenv('MPDIR')
-device = os.getenv('MPDEVICE')
 sys.path.append(''.join((mp, '/tools')))
 import pyboard
+
+errmsg = 'pyb_boot error: usage pyb_boot device.'
 def main():
+    if len(sys.argv) < 2:
+        print(errmsg)
+        sys.exit(1)
+    device = sys.argv[1]
     pyb=pyboard.Pyboard(device)
     pyb.enter_raw_repl()
     try:
-        pyb.exec_raw('pyb.bootloader()')
+        pyb.exec_raw('import pyb;pyb.bootloader()')
         print('Failed to enter DFU mode')
     except Exception:  # It will throw one!
         pass