test: dfu: script enhancements

Various misc enhancements to dfu_gadget_test.sh:

* After every write (download), perform a write to a different file
  with different data. This ensures that the DFU buffer's content is
  replaced, so that if the read (upload) succeeds, we know that the
  correct data was actually read from the storage device, rather than
  simply being left over in the DFU buffer. This requires two alt
  setting names to be passed to the script, and a dummy data file to
  be generated by dfu_gadget_test_init.sh.

* Fix the assumption that dfu_gadget_test.sh is run from the directory
  that contains it, by cd'ing to that directory before invoking
  ./dfu_gadget_test_init.sh.

* Use $DIR$RCV_DIR consistently, rather than using plain $RCV_DIR in
  some places.

* Add 959, 961 test file sizes, to be consistent with having one
  more than and one less than all the other "round" sizes 64, 128, and
  4096.

* Remove references to $BKP_DIR from dfu_gadget_test_init.sh, since it
  isn't used.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

test/dfu/README

 DFU TEST CASE DESCRIPTION:
 
-The prerequisites for running this script are assured by dfu_gadget_test_init.sh.
+The prerequisites for running this script are assured by
+dfu_gadget_test_init.sh, which is automatically invoked by dfu_gadget_test.sh.
 In this file user is able to generate their own set of test files by altering
 the default set of TEST_FILES_SIZES variable.
 The dfu_gadget_test_init.sh would generate test images only if they are not
 already generated.
 
-Moreover, on a target device the "dfu_alt_info" env variable should be extended
-to have "dfu_test.bin fat 0 6;" \ entry ([1]). For reference please consult the
-config file for TRATS/TRATS2 devices (./include/configs/trats{2}.h)
+On the target device, environment variable "dfu_alt_info" must contain at
+least:
 
-One can use fat, ext4 or any other supported file system, which can be
-created in a convenient way with exporting partitions via UMS (ums 0 mmc 0)
-and using standard tools on host (like mkfs.ext4).
+    dfu_test.bin fat 0 6;dfudummy.bin fat 0 6
+
+Depending on your device, you may need to replace "fat" with
+"ext4", and "6" with the relevant partition number. For reference please
+consult the config file for TRATS/TRATS2 devices
+(../../include/configs/trats{2}.h)
+
+One can use fat, ext4 or any other supported file system supported by U-Boot.
+These can be created by exporting storage devices via UMS (ums 0 mmc 0) and
+using standard tools on host (like mkfs.ext4).
 
 Example usage:
 1. On the target:
-   env default -a
+   setenv dfu_alt_info dfu_test.bin fat 0 6\;dfudummy.bin fat 0 6
    dfu 0 mmc 0
 2. On the host:
-   ./dfu_gadget_test.sh 11 [test_file]
-
-where 11 is the mumber of alt setting corresponding to entry [1] and [test_file]
-is an optional parameter, with which one can explicitly indicate the test file
-to be used.
+   test/dfu/dfu_gadget_test.sh dfu_test.bin dfudummy.bin
 
-The number of the alt setting entry can be obtained with dfu-util -l command.
-In its output one should look for the 'name="dfu_test1.bin"' and corresponding
-alt=11.
+... where dfu_test.bin and dfudummy.bin are the names of the alt settings from
+$dfu_alt_info.

test/dfu/dfu_gadget_test.sh

 #! /bin/bash
+
 set -e # any command return if not equal to zero
 clear
 
@@ -11,10 +12,11 @@ SUFFIX=img
 RCV_DIR=rcv/
 LOG_FILE=./log/log-`date +%d-%m-%Y_%H-%M-%S`
 
+cd `dirname $0`
 ./dfu_gadget_test_init.sh
 
 cleanup () {
-    rm -rf $RCV_DIR
+    rm -rf $DIR$RCV_DIR
 }
 
 die () {
@@ -40,6 +42,8 @@ dfu_test_file () {
 
     MD5_TX=$MD5SUM
 
+    dfu-util -D ${DIR}/dfudummy.bin -a $TARGET_ALT_SETTING_B >> $LOG_FILE 2>&1 || die $?
+
     N_FILE=$DIR$RCV_DIR${1:2}"_rcv"
 
     dfu-util -U $N_FILE -a $TARGET_ALT_SETTING >> $LOG_FILE 2>&1 || die $?
@@ -62,7 +66,7 @@ printf "$COLOUR_GREEN===========================================================
 echo "DFU EP0 transmission test program"
 echo "Trouble shoot -> disable DBG (even the KERN_DEBUG) in the UDC driver"
 echo "@ -> TRATS2 # dfu 0 mmc 0"
-mkdir -p $RCV_DIR
+mkdir -p $DIR$RCV_DIR
 touch $LOG_FILE
 
 if [ $# -eq 0 ]
@@ -72,10 +76,11 @@ then
 fi
 
 TARGET_ALT_SETTING=$1
+TARGET_ALT_SETTING_B=$2
 
-if [ -n "$2" ]
+if [ -n "$3" ]
 then
-	dfu_test_file $2
+	dfu_test_file $3
 else
 	for file in $DIR*.$SUFFIX
 	do

test/dfu/dfu_gadget_test_init.sh

 #! /bin/bash
+
 set -e # any command return if not equal to zero
 clear
 
@@ -7,9 +8,8 @@ COLOUR_GREEN="\33[32m"
 COLOUR_DEFAULT="\33[0m"
 
 LOG_DIR="./log"
-BKP_DIR="./bkp"
 
-TEST_FILES_SIZES="127 128 129 8M 4095 4096 4097 63 64 65 960"
+TEST_FILES_SIZES="63 64 65 127 128 129 4095 4096 4097 959 960 961 8M"
 
 printf "Init script for generating data necessary for DFU test script"
 
@@ -17,10 +17,6 @@ if [ ! -d $LOG_DIR ]; then
     `mkdir $LOG_DIR`
 fi
 
-if [ ! -d $BKP_DIR ]; then
-    `mkdir $BKP_DIR`
-fi
-
 for size in $TEST_FILES_SIZES
 do
     FILE="./dat_$size.img"
@@ -28,6 +24,7 @@ do
 	dd if=/dev/urandom of="./dat_$size.img" bs=$size count=1 > /dev/null 2>&1 || exit $?
     fi
 done
+dd if=/dev/urandom of="./dfudummy.bin" bs=1024 count=1 > /dev/null 2>&1 || exit $?
 
 printf "$COLOUR_GREEN OK $COLOUR_DEFAULT \n"