Got the bootdesc building.

SConstruct

@@ -237,9 +237,26 @@ else :
 
     Alias ('tasks', tasks)
 
+##########  Create the boot description ########################
+
+    taskName = 'bootdesc'
+
+    bootdescEnvironment = baseEnvironment.Clone(
+        CC = 'arm-none-linux-gnueabi-gcc',
+        CCFLAGS = ['-g', '-nostdlib', '-ffreestanding', '-std=gnu99', '-Wall', '-Werror'],
+        LINKFLAGS = ['-nostdlib', '-Ttasks/' + taskName + '/linker.lds'],
+        ASFLAGS = ['-D__ASSEMBLY__'],
+        PROGSUFFIX = '.axf',
+        LIBS = ['gcc'],
+        CPPPATH = ['#' + includeDirectory])
+
+    bootdesc = SConscript('tasks/' + taskName + '/SConscript', variant_dir = buildDirectory + '/tasks/' + taskName, duplicate = 0, exports = {'environment': bootdescEnvironment, 'images': [startAxf] + tasks}) 
+
+    Alias('bootdesc', bootdesc)
+
 ##########  Other rules. ########################
 
-    Default(crts.values() + libs.values() + [libelf, startAxf] + tasks)
+    Default(crts.values() + libs.values() + [libelf, startAxf] + tasks + bootdesc)
     
     Clean('.', [buildDirectory])
 

tasks/bootdesc/.gitignore

@@ -1,2 +0,0 @@
-*.txt
-bootdesc.c.append

tasks/bootdesc/SConscript

@@ -0,0 +1,91 @@
+# -*- mode: python; coding: utf-8; -*-
+
+#  Codezero -- a microkernel for embedded systems.
+#
+#  Copyright © 2009  B Labs Ltd
+#
+#  This program is free software: you can redistribute it and/or modify it under the terms of the GNU
+#  General Public License as published by the Free Software Foundation, either version 3 of the License, or
+#  (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+#  the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+#  License for more details.
+#
+#  You should have received a copy of the GNU General Public License along with this program.  If not, see
+#  <http://www.gnu.org/licenses/>.
+#
+#  Author: Russel Winder
+
+import os.path
+import subprocess
+import shutil
+
+Import('environment', 'images')
+
+bootdescTemplate = \
+'''
+/* This file is autogenerated, do not edit by hand. */
+
+/* Supervisor task at load time. */
+struct svc_image {
+        char name[16];
+        unsigned int phys_start;
+        unsigned int phys_end;
+} __attribute__((__packed__));
+
+/* Supervisor task descriptor at load time */
+struct bootdesc {
+        int desc_size;
+        int total_images;
+        struct svc_image images[];
+} __attribute__((__packed__));
+
+struct bootdesc bootdesc = {
+        .desc_size = sizeof(struct bootdesc) + sizeof(struct svc_image) * %s,
+        .total_images = %s,
+        .images = {
+%s
+        },
+};
+'''
+
+imageTemplate = \
+'''             [%s] = {
+                        .name = "%s",
+                        .phys_start = %s,
+                        .phys_end = %s,
+                },
+'''
+
+def generateLocationData(image):
+    process = subprocess.Popen('tools/pyelf/readelf.py --lma-start-end ' + image.path, shell=True, stdout=subprocess.PIPE)
+    assert process.wait() == 0
+    return (process.stdout.readline().strip(), process.stdout.readline().strip().split()[1], process.stdout.readline().strip().split()[1])
+
+def generateBootdesc(target, source, env):
+    '''
+    Extracts name, start, end information from the kernel and each svc task.
+    Uses this information to produce bootdesc.c
+    '''
+    with open(target[0].path, 'w' ) as f:
+        imagesString = ''
+        numberOfImages = len(source) - 1
+        for index in range(1, len(source)):
+            imagesString += imageTemplate % ((index - 1,) + generateLocationData(source[index]))
+        f.write(bootdescTemplate % (numberOfImages, numberOfImages, imagesString))
+
+def relocateBootdesc(target, source, env):
+    name, start, end = generateLocationData(source[1])
+    process = subprocess.Popen(executable='arm-none-linux-gnueabi-objcopy', args=(
+            '--adjust-section-vma .data=' + end,
+            source[0].path))
+    assert process.wait() == 0
+    shutil.copyfile(source[0].path, target[0].path)
+
+bootdescSource = environment.Command('bootdesc.c', images, generateBootdesc)
+objects = environment.Object(bootdescSource)
+Depends(objects, environment['configFiles'])
+bootdesc = environment.Command('bootdesc.axf', environment.Program('bootdesc_intermediate', objects) + [images[0]] , relocateBootdesc)
+
+Return('bootdesc')

tasks/bootdesc/bootdesc.c.templ

@@ -1,16 +0,0 @@
-
-
-/* Supervisor task at load time. */
-struct svc_image {
-	char name[16];
-	unsigned int phys_start;
-	unsigned int phys_end;
-} __attribute__((__packed__));
-
-/* Supervisor task descriptor at load time */
-struct bootdesc {
-	int desc_size;
-	int total_images;
-	struct svc_image images[];
-} __attribute__((__packed__));
-