diff --git a/objects/pflash/ccan/check_type/LICENSE b/objects/pflash/ccan/check_type/LICENSE
new file mode 100644
index 0000000..feb9b11
--- /dev/null
+++ b/objects/pflash/ccan/check_type/LICENSE
@@ -0,0 +1,28 @@
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent owner(s) (each and all, an "owner") of an original work of authorship and/or a database (each, a "Work").
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+
+For these and/or other purposes and motivations, and without any expectation of additional consideration or compensation, the person associating CC0 with a Work (the "Affirmer"), to the extent that he or she is an owner of Copyright and Related Rights in the Work, voluntarily elects to apply CC0 to the Work and publicly distribute the Work under its terms, with knowledge of his or her Copyright and Related Rights in the Work and the meaning and intended legal effect of CC0 on those rights.
+
+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:
+
+    the right to reproduce, adapt, distribute, perform, display, communicate, and translate a Work;
+    moral rights retained by the original author(s) and/or performer(s);
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+    other similar, equivalent or corresponding rights throughout the world based on applicable law or treaty, and any national implementations thereof.
+
+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.
+
+4. Limitations and Disclaimers.
+
+    No trademark or patent rights held by Affirmer are waived, abandoned, surrendered, licensed or otherwise affected by this document.
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+    Affirmer disclaims responsibility for clearing rights of other persons that may apply to the Work or any use thereof, including without limitation any person's Copyright and Related Rights in the Work. Further, Affirmer disclaims responsibility for obtaining any necessary consents, permissions or other rights required for any use of the Work.
+    Affirmer understands and acknowledges that Creative Commons is not a party to this document and has no duty or obligation with respect to this CC0 or use of the Work.
diff --git a/objects/pflash/ccan/check_type/_info b/objects/pflash/ccan/check_type/_info
new file mode 100644
index 0000000..cb19e20
--- /dev/null
+++ b/objects/pflash/ccan/check_type/_info
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <string.h>
+#include "config.h"
+
+/**
+ * check_type - routines for compile time type checking
+ *
+ * C has fairly weak typing: ints get automatically converted to longs, signed
+ * to unsigned, etc.  There are some cases where this is best avoided, and
+ * these macros provide methods for evoking warnings (or build errors) when
+ * a precise type isn't used.
+ *
+ * On compilers which don't support typeof() these routines are less effective,
+ * since they have to use sizeof() which can only distiguish between types of
+ * different size.
+ *
+ * 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) {
+#if !HAVE_TYPEOF
+		printf("ccan/build_assert\n");
+#endif
+		return 0;
+	}
+
+	return 1;
+}
diff --git a/objects/pflash/ccan/check_type/check_type.h b/objects/pflash/ccan/check_type/check_type.h
new file mode 100644
index 0000000..ef4a9b3
--- /dev/null
+++ b/objects/pflash/ccan/check_type/check_type.h
@@ -0,0 +1,64 @@
+/* CC0 (Public domain) - see LICENSE file for details */
+#ifndef CCAN_CHECK_TYPE_H
+#define CCAN_CHECK_TYPE_H
+#include "config.h"
+
+/**
+ * check_type - issue a warning or build failure if type is not correct.
+ * @expr: the expression whose type we should check (not evaluated).
+ * @type: the exact type we expect the expression to be.
+ *
+ * This macro is usually used within other macros to try to ensure that a macro
+ * argument is of the expected type.  No type promotion of the expression is
+ * done: an unsigned int is not the same as an int!
+ *
+ * check_type() always evaluates to 0.
+ *
+ * If your compiler does not support typeof, then the best we can do is fail
+ * to compile if the sizes of the types are unequal (a less complete check).
+ *
+ * Example:
+ *	// They should always pass a 64-bit value to _set_some_value!
+ *	#define set_some_value(expr)			\
+ *		_set_some_value((check_type((expr), uint64_t), (expr)))
+ */
+
+/**
+ * check_types_match - issue a warning or build failure if types are not same.
+ * @expr1: the first expression (not evaluated).
+ * @expr2: the second expression (not evaluated).
+ *
+ * This macro is usually used within other macros to try to ensure that
+ * arguments are of identical types.  No type promotion of the expressions is
+ * done: an unsigned int is not the same as an int!
+ *
+ * check_types_match() always evaluates to 0.
+ *
+ * If your compiler does not support typeof, then the best we can do is fail
+ * to compile if the sizes of the types are unequal (a less complete check).
+ *
+ * Example:
+ *	// Do subtraction to get to enclosing type, but make sure that
+ *	// pointer is of correct type for that member.
+ *	#define container_of(mbr_ptr, encl_type, mbr)			\
+ *		(check_types_match((mbr_ptr), &((encl_type *)0)->mbr),	\
+ *		 ((encl_type *)						\
+ *		  ((char *)(mbr_ptr) - offsetof(enclosing_type, mbr))))
+ */
+#if HAVE_TYPEOF
+#define check_type(expr, type)			\
+	((typeof(expr) *)0 != (type *)0)
+
+#define check_types_match(expr1, expr2)		\
+	((typeof(expr1) *)0 != (typeof(expr2) *)0)
+#else
+#include <ccan/build_assert/build_assert.h>
+/* Without typeof, we can only test the sizes. */
+#define check_type(expr, type)					\
+	BUILD_ASSERT_OR_ZERO(sizeof(expr) == sizeof(type))
+
+#define check_types_match(expr1, expr2)				\
+	BUILD_ASSERT_OR_ZERO(sizeof(expr1) == sizeof(expr2))
+#endif /* HAVE_TYPEOF */
+
+#endif /* CCAN_CHECK_TYPE_H */
diff --git a/objects/pflash/ccan/check_type/test/compile_fail-check_type.c b/objects/pflash/ccan/check_type/test/compile_fail-check_type.c
new file mode 100644
index 0000000..00dad58
--- /dev/null
+++ b/objects/pflash/ccan/check_type/test/compile_fail-check_type.c
@@ -0,0 +1,9 @@
+#include <ccan/check_type/check_type.h>
+
+int main(int argc, char *argv[])
+{
+#ifdef FAIL
+	check_type(argc, char);
+#endif
+	return 0;
+}
diff --git a/objects/pflash/ccan/check_type/test/compile_fail-check_type_unsigned.c b/objects/pflash/ccan/check_type/test/compile_fail-check_type_unsigned.c
new file mode 100644
index 0000000..8c0227a
--- /dev/null
+++ b/objects/pflash/ccan/check_type/test/compile_fail-check_type_unsigned.c
@@ -0,0 +1,14 @@
+#include <ccan/check_type/check_type.h>
+
+int main(int argc, char *argv[])
+{
+#ifdef FAIL
+#if HAVE_TYPEOF
+	check_type(argc, unsigned int);
+#else
+	/* This doesn't work without typeof, so just fail */
+#error "Fail without typeof"
+#endif
+#endif
+	return 0;
+}
diff --git a/objects/pflash/ccan/check_type/test/compile_fail-check_types_match.c b/objects/pflash/ccan/check_type/test/compile_fail-check_types_match.c
new file mode 100644
index 0000000..081304f
--- /dev/null
+++ b/objects/pflash/ccan/check_type/test/compile_fail-check_types_match.c
@@ -0,0 +1,10 @@
+#include <ccan/check_type/check_type.h>
+
+int main(int argc, char *argv[])
+{
+	unsigned char x = argc;
+#ifdef FAIL
+	check_types_match(argc, x);
+#endif
+	return x;
+}
diff --git a/objects/pflash/ccan/check_type/test/run.c b/objects/pflash/ccan/check_type/test/run.c
new file mode 100644
index 0000000..eb99632
--- /dev/null
+++ b/objects/pflash/ccan/check_type/test/run.c
@@ -0,0 +1,22 @@
+#include <ccan/check_type/check_type.h>
+#include <ccan/tap/tap.h>
+
+int main(int argc, char *argv[])
+{
+	int x = 0, y = 0;
+
+	plan_tests(9);
+
+	ok1(check_type(argc, int) == 0);
+	ok1(check_type(&argc, int *) == 0);
+	ok1(check_types_match(argc, argc) == 0);
+	ok1(check_types_match(argc, x) == 0);
+	ok1(check_types_match(&argc, &x) == 0);
+
+	ok1(check_type(x++, int) == 0);
+	ok(x == 0, "check_type does not evaluate expression");
+	ok1(check_types_match(x++, y++) == 0);
+	ok(x == 0 && y == 0, "check_types_match does not evaluate expressions");
+
+	return exit_status();
+}