Add option for configuring path to dtc binary in mkimage command. The
dtc binary might not always be located in $PATH.

Signed-off-by: Luka Perkov <l...@openwrt.org>
---
 doc/mkimage.1     |  4 ++++
 tools/fit_image.c |  3 ++-
 tools/mkimage.c   | 14 +++++++++++---
 tools/mkimage.h   |  5 +++--
 4 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/doc/mkimage.1 b/doc/mkimage.1
index 39652c8..8cf5686 100644
--- a/doc/mkimage.1
+++ b/doc/mkimage.1
@@ -82,6 +82,10 @@ Set XIP (execute in place) flag.
 .B Create FIT image:
 
 .TP
+.BI "\-B [" "dtc bin" "]"
+Set path to the device tree compiler binary.
+
+.TP
 .BI "\-D [" "dtc options" "]"
 Provide special options to the device tree compiler that is used to
 create the image.
diff --git a/tools/fit_image.c b/tools/fit_image.c
index 76bbba1..cd4db58 100644
--- a/tools/fit_image.c
+++ b/tools/fit_image.c
@@ -82,7 +82,8 @@ static int fit_handle_file (struct mkimage_params *params)
 
        /* dtc -I dts -O dtb -p 500 datafile > tmpfile */
        sprintf (cmd, "%s %s %s > %s",
-               MKIMAGE_DTC, params->dtc, params->datafile, tmpfile);
+               params->dtc_bin, params->dtc_options, params->datafile,
+               tmpfile);
        debug ("Trying to execute \"%s\"\n", cmd);
        if (system (cmd) == -1) {
                fprintf (stderr, "%s: system(%s) failed: %s\n",
diff --git a/tools/mkimage.c b/tools/mkimage.c
index e43b09f..ac4ced7 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -37,7 +37,8 @@ struct mkimage_params params = {
        .arch = IH_ARCH_PPC,
        .type = IH_TYPE_KERNEL,
        .comp = IH_COMP_GZIP,
-       .dtc = MKIMAGE_DEFAULT_DTC_OPTIONS,
+       .dtc_bin = MKIMAGE_DTC,
+       .dtc_options = MKIMAGE_DEFAULT_DTC_OPTIONS,
        .imagename = "",
        .imagename2 = "",
 };
@@ -189,10 +190,15 @@ main (int argc, char **argv)
                                        genimg_get_comp_id (*++argv)) < 0)
                                        usage ();
                                goto NXTARG;
+                       case 'B':
+                               if (--argc <= 0)
+                                       usage ();
+                               params.dtc_bin = *++argv;
+                               goto NXTARG;
                        case 'D':
                                if (--argc <= 0)
                                        usage ();
-                               params.dtc = *++argv;
+                               params.dtc_options = *++argv;
                                goto NXTARG;
 
                        case 'O':
@@ -623,7 +629,9 @@ usage ()
                         "          -d ==> use image data from 'datafile'\n"
                         "          -x ==> set XIP (execute in place)\n",
                params.cmdname);
-       fprintf (stderr, "       %s [-D dtc_options] -f fit-image.its 
fit-image\n",
+       fprintf (stderr, "       %s [-B dtc_bin] [-D dtc_options] -f 
fit-image.its fit-image\n",
+                        "           -B ==> set path to the dtc binary\n",
+                        "           -D ==> set options that will be passed to 
dtc\n",
                params.cmdname);
        fprintf (stderr, "       %s -V ==> print version information and 
exit\n",
                params.cmdname);
diff --git a/tools/mkimage.h b/tools/mkimage.h
index ea45f5c..1c3b1e1 100644
--- a/tools/mkimage.h
+++ b/tools/mkimage.h
@@ -46,7 +46,7 @@
 #define MKIMAGE_MAX_TMPFILE_LEN                256
 #define MKIMAGE_DEFAULT_DTC_OPTIONS    "-I dts -O dtb -p 500"
 #define MKIMAGE_MAX_DTC_CMDLINE_LEN    512
-#define MKIMAGE_DTC                    "dtc"   /* assume dtc is in $PATH */
+#define MKIMAGE_DTC                    "dtc"
 
 /*
  * This structure defines all such variables those are initialized by
@@ -65,7 +65,8 @@ struct mkimage_params {
        int arch;
        int type;
        int comp;
-       char *dtc;
+       char *dtc_bin;
+       char *dtc_options;
        unsigned int addr;
        unsigned int ep;
        char *imagename;
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