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@@ -0,0 +1,82 @@
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+From f3f431a712729a1af94d01bd1bfde17a252ff02c Mon Sep 17 00:00:00 2001
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+From: Paul Kocialkowski <[email protected]>
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+Date: Sun, 26 Jul 2015 18:48:15 +0200
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+Subject: [PATCH] Reproducible U-Boot build support, using SOURCE_DATE_EPOCH
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+
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+In order to achieve reproducible builds in U-Boot, timestamps that are defined
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+at build-time have to be somewhat eliminated. The SOURCE_DATE_EPOCH environment
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+variable allows setting a fixed value for those timestamps.
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+
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+Simply by setting SOURCE_DATE_EPOCH to a fixed value, a number of targets can be
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+built reproducibly. This is the case for e.g. sunxi devices.
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+
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+However, some other devices might need some more tweaks, especially regarding
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+the image generation tools.
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+
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+Signed-off-by: Paul Kocialkowski <[email protected]>
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+---
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+ Makefile | 7 ++++---
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+ README | 12 ++++++++++++
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+ tools/default_image.c | 21 ++++++++++++++++++++-
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+ 3 files changed, 36 insertions(+), 4 deletions(-)
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+
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+--- a/README
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++++ b/README
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+@@ -2785,6 +2785,18 @@ Low Level (hardware related) configurati
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+ that is executed before the actual U-Boot. E.g. when
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+ compiling a NAND SPL.
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+
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++Reproducible builds
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++-------------------
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++
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++In order to achieve reproducible builds, timestamps used in the U-Boot build
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++process have to be set to a fixed value.
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++
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++This is done using the SOURCE_DATE_EPOCH environment variable.
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++SOURCE_DATE_EPOCH is to be set on the build host's shell, not as a configuration
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++option for U-Boot or an environment variable in U-Boot.
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++
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++SOURCE_DATE_EPOCH should be set to a number of seconds since the epoch, in UTC.
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++
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+ Building the Software:
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+ ======================
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+
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+--- a/tools/default_image.c
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++++ b/tools/default_image.c
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+@@ -101,6 +101,9 @@ static void image_set_header (void *ptr,
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+ struct mkimage_params *params)
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+ {
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+ uint32_t checksum;
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++ char *source_date_epoch;
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++ struct tm *time_universal;
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++ time_t time;
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+
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+ image_header_t * hdr = (image_header_t *)ptr;
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+
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+@@ -109,9 +112,25 @@ static void image_set_header (void *ptr,
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+ sizeof(image_header_t)),
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+ sbuf->st_size - sizeof(image_header_t));
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+
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++source_date_epoch = getenv("SOURCE_DATE_EPOCH");
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++ if (source_date_epoch != NULL) {
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++ time = (time_t) strtol(source_date_epoch, NULL, 10);
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++
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++ time_universal = gmtime(&time);
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++ if (time_universal == NULL) {
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++ fprintf(stderr, "%s: SOURCE_DATE_EPOCH is not valid\n",
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++ __func__);
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++ time = 0;
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++ } else {
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++ time = mktime(time_universal);
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++ }
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++ } else {
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++ time = sbuf->st_mtime;
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++ }
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++
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+ /* Build new header */
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+ image_set_magic (hdr, IH_MAGIC);
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+- image_set_time (hdr, sbuf->st_mtime);
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++ image_set_time(hdr, time);
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+ image_set_size (hdr, sbuf->st_size - sizeof(image_header_t));
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+ image_set_load (hdr, params->addr);
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+ image_set_ep (hdr, params->ep);
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Dirk Neukirchen