diff --git a/objects/pflash/ccan/build_assert/LICENSE b/objects/pflash/ccan/build_assert/LICENSE
new file mode 100644
index 0000000..feb9b11
--- /dev/null
+++ b/objects/pflash/ccan/build_assert/LICENSE
@@ -0,0 +1,28 @@
+Statement of Purpose
+
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+
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+
+1. Copyright and Related Rights. A Work made available under CC0 may be protected by copyright and related or neighboring rights ("Copyright and Related Rights"). Copyright and Related Rights include, but are not limited to, the following:
+
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+
+2. Waiver. To the greatest extent permitted by, but not in contravention of, applicable law, Affirmer hereby overtly, fully, permanently, irrevocably and unconditionally waives, abandons, and surrenders all of Affirmer's Copyright and Related Rights and associated claims and causes of action, whether now known or unknown (including existing as well as future claims and causes of action), in the Work (i) in all territories worldwide, (ii) for the maximum duration provided by applicable law or treaty (including future time extensions), (iii) in any current or future medium and for any number of copies, and (iv) for any purpose whatsoever, including without limitation commercial, advertising or promotional purposes (the "Waiver"). Affirmer makes the Waiver for the benefit of each member of the public at large and to the detriment of Affirmer's heirs and successors, fully intending that such Waiver shall not be subject to revocation, rescission, cancellation, termination, or any other legal or equitable action to disrupt the quiet enjoyment of the Work by the public as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason be judged legally invalid or ineffective under applicable law, then the Waiver shall be preserved to the maximum extent permitted taking into account Affirmer's express Statement of Purpose. In addition, to the extent the Waiver is so judged Affirmer hereby grants to each affected person a royalty-free, non transferable, non sublicensable, non exclusive, irrevocable and unconditional license to exercise Affirmer's Copyright and Related Rights in the Work (i) in all territories worldwide, (ii) for the maximum duration provided by applicable law or treaty (including future time extensions), (iii) in any current or future medium and for any number of copies, and (iv) for any purpose whatsoever, including without limitation commercial, advertising or promotional purposes (the "License"). The License shall be deemed effective as of the date CC0 was applied by Affirmer to the Work. Should any part of the License for any reason be judged legally invalid or ineffective under applicable law, such partial invalidity or ineffectiveness shall not invalidate the remainder of the License, and in such case Affirmer hereby affirms that he or she will not (i) exercise any of his or her remaining Copyright and Related Rights in the Work or (ii) assert any associated claims and causes of action with respect to the Work, in either case contrary to Affirmer's express Statement of Purpose.
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diff --git a/objects/pflash/ccan/build_assert/_info b/objects/pflash/ccan/build_assert/_info
new file mode 100644
index 0000000..bce92b7
--- /dev/null
+++ b/objects/pflash/ccan/build_assert/_info
@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <string.h>
+#include "config.h"
+
+/**
+ * build_assert - routines for build-time assertions
+ *
+ * This code provides routines which will cause compilation to fail should some
+ * assertion be untrue: such failures are preferable to run-time assertions,
+ * but much more limited since they can only depends on compile-time constants.
+ *
+ * These assertions are most useful when two parts of the code must be kept in
+ * sync: it is better to avoid such cases if possible, but seconds best is to
+ * detect invalid changes at build time.
+ *
+ * For example, a tricky piece of code might rely on a certain element being at
+ * the start of the structure.  To ensure that future changes don't break it,
+ * you would catch such changes in your code like so:
+ *
+ * Example:
+ *	#include <stddef.h>
+ *	#include <ccan/build_assert/build_assert.h>
+ *
+ *	struct foo {
+ *		char string[5];
+ *		int x;
+ *	};
+ *
+ *	static char *foo_string(struct foo *foo)
+ *	{
+ *		// This trick requires that the string be first in the structure
+ *		BUILD_ASSERT(offsetof(struct foo, string) == 0);
+ *		return (char *)foo;
+ *	}
+ *
+ * License: CC0 (Public domain)
+ * Author: Rusty Russell <rusty@rustcorp.com.au>
+ */
+int main(int argc, char *argv[])
+{
+	if (argc != 2)
+		return 1;
+
+	if (strcmp(argv[1], "depends") == 0)
+		/* Nothing. */
+		return 0;
+
+	return 1;
+}
diff --git a/objects/pflash/ccan/build_assert/build_assert.h b/objects/pflash/ccan/build_assert/build_assert.h
new file mode 100644
index 0000000..bd07254
--- /dev/null
+++ b/objects/pflash/ccan/build_assert/build_assert.h
@@ -0,0 +1,40 @@
+/* CC0 (Public domain) - see LICENSE file for details */
+#ifndef CCAN_BUILD_ASSERT_H
+#define CCAN_BUILD_ASSERT_H
+
+/**
+ * BUILD_ASSERT - assert a build-time dependency.
+ * @cond: the compile-time condition which must be true.
+ *
+ * Your compile will fail if the condition isn't true, or can't be evaluated
+ * by the compiler.  This can only be used within a function.
+ *
+ * Example:
+ *	#include <stddef.h>
+ *	...
+ *	static char *foo_to_char(struct foo *foo)
+ *	{
+ *		// This code needs string to be at start of foo.
+ *		BUILD_ASSERT(offsetof(struct foo, string) == 0);
+ *		return (char *)foo;
+ *	}
+ */
+#define BUILD_ASSERT(cond) \
+	do { (void) sizeof(char [1 - 2*!(cond)]); } while(0)
+
+/**
+ * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
+ * @cond: the compile-time condition which must be true.
+ *
+ * Your compile will fail if the condition isn't true, or can't be evaluated
+ * by the compiler.  This can be used in an expression: its value is "0".
+ *
+ * Example:
+ *	#define foo_to_char(foo)					\
+ *		 ((char *)(foo)						\
+ *		  + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
+ */
+#define BUILD_ASSERT_OR_ZERO(cond) \
+	(sizeof(char [1 - 2*!(cond)]) - 1)
+
+#endif /* CCAN_BUILD_ASSERT_H */
diff --git a/objects/pflash/ccan/build_assert/test/compile_fail-expr.c b/objects/pflash/ccan/build_assert/test/compile_fail-expr.c
new file mode 100644
index 0000000..1c6e31c
--- /dev/null
+++ b/objects/pflash/ccan/build_assert/test/compile_fail-expr.c
@@ -0,0 +1,10 @@
+#include <ccan/build_assert/build_assert.h>
+
+int main(int argc, char *argv[])
+{
+#ifdef FAIL
+	return BUILD_ASSERT_OR_ZERO(1 == 0);
+#else
+	return 0;
+#endif
+}
diff --git a/objects/pflash/ccan/build_assert/test/compile_fail.c b/objects/pflash/ccan/build_assert/test/compile_fail.c
new file mode 100644
index 0000000..f29c3fd
--- /dev/null
+++ b/objects/pflash/ccan/build_assert/test/compile_fail.c
@@ -0,0 +1,9 @@
+#include <ccan/build_assert/build_assert.h>
+
+int main(int argc, char *argv[])
+{
+#ifdef FAIL
+	BUILD_ASSERT(1 == 0);
+#endif
+	return 0;
+}
diff --git a/objects/pflash/ccan/build_assert/test/compile_ok.c b/objects/pflash/ccan/build_assert/test/compile_ok.c
new file mode 100644
index 0000000..20c2af6
--- /dev/null
+++ b/objects/pflash/ccan/build_assert/test/compile_ok.c
@@ -0,0 +1,7 @@
+#include <ccan/build_assert/build_assert.h>
+
+int main(int argc, char *argv[])
+{
+	BUILD_ASSERT(1 == 1);
+	return 0;
+}
diff --git a/objects/pflash/ccan/build_assert/test/run-BUILD_ASSERT_OR_ZERO.c b/objects/pflash/ccan/build_assert/test/run-BUILD_ASSERT_OR_ZERO.c
new file mode 100644
index 0000000..a5450f1
--- /dev/null
+++ b/objects/pflash/ccan/build_assert/test/run-BUILD_ASSERT_OR_ZERO.c
@@ -0,0 +1,9 @@
+#include <ccan/build_assert/build_assert.h>
+#include <ccan/tap/tap.h>
+
+int main(int argc, char *argv[])
+{
+	plan_tests(1);
+	ok1(BUILD_ASSERT_OR_ZERO(1 == 1) == 0);
+	return exit_status();
+}