Add support for metadata in barebox images

It's often useful to get some information about a barebox image
before starting or flashing it. This patch introduces barebox
Image MetaData (IMD). When enabled a barebox image will contain
a list of tags containing the desired information. We have tags
for:

- the barebox release (2014.07.0-00160-g035de50-dirty)
- the build timestamp (#741 Mon Jul 28 15:08:54 CEST 2014)
- the board model the image is intended for
- the device tree toplevel compatible property

Also there is an additional generic key-value store which stores
parameters for which no dedicated tag exists. In this patch it
is used for the memory size an image supports.

Since there is no fixed offset in a barebox image which can be
used for storing the information, the metadata is stored somewhere
in the image and found by iterating over the image. This works
for most image types, but obviously not for SoC images which are
encoded or encrypted in some way.

There is a 'imd' tool compiled from the same sources for barebox,
for the compile host and for the target, so the metadata information
is available whereever needed.

For device tree boards the model and of_compatible tags are automatically
generated.

Example output of the imd tool for a Phytec phyFLEX image:

build: #889 Wed Jul 30 16:08:54 CEST 2014
release: 2014.07.0-00167-g6b2070d-dirty
parameter: memsize=1024
of_compatible: phytec,imx6x-pbab01 phytec,imx6dl-pfla02 fsl,imx6dl
model: Phytec phyFLEX-i.MX6 Duallite Carrier-Board

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

5 files changed, 30 insertions, 0 deletions

diff --git a/arch/arm/boards/freescale-mx53-qsb/lowlevel.c b/arch/arm/boards/freescale-mx53-qsb/lowlevel.c
index 51b9ef8db7..7d1c1d5b2a 100644
--- a/arch/arm/boards/freescale-mx53-qsb/lowlevel.c
+++ b/arch/arm/boards/freescale-mx53-qsb/lowlevel.c
@@ -2,6 +2,7 @@
 #include <mach/esdctl.h>
 #include <asm/barebox-arm-head.h>
 #include <asm/barebox-arm.h>
+#include <image-metadata.h>
 
 extern char __dtb_imx53_qsb_start[];
 
diff --git a/arch/arm/boards/phytec-phyflex-imx6/lowlevel.c b/arch/arm/boards/phytec-phyflex-imx6/lowlevel.c
index 55aae00954..1d08f0561a 100644
--- a/arch/arm/boards/phytec-phyflex-imx6/lowlevel.c
+++ b/arch/arm/boards/phytec-phyflex-imx6/lowlevel.c
@@ -16,6 +16,7 @@
 #include <common.h>
 #include <sizes.h>
 #include <io.h>
+#include <image-metadata.h>
 #include <asm/barebox-arm-head.h>
 #include <asm/barebox-arm.h>
 #include <asm/sections.h>
@@ -57,6 +58,11 @@ extern char __dtb_imx6q_phytec_pbab01_start[];
 extern char __dtb_imx6dl_phytec_pbab01_start[];
 extern char __dtb_imx6s_phytec_pbab01_start[];
 
+BAREBOX_IMD_TAG_STRING(phyflex_mx6_memsize_512M, IMD_TYPE_PARAMETER, "memsize=512", 0);
+BAREBOX_IMD_TAG_STRING(phyflex_mx6_memsize_1G, IMD_TYPE_PARAMETER, "memsize=1024", 0);
+BAREBOX_IMD_TAG_STRING(phyflex_mx6_memsize_2G, IMD_TYPE_PARAMETER, "memsize=2048", 0);
+BAREBOX_IMD_TAG_STRING(phyflex_mx6_memsize_4G, IMD_TYPE_PARAMETER, "memsize=4096", 0);
+
 ENTRY_FUNCTION(start_phytec_pbab01_1gib, r0, r1, r2)
 {
 	void *fdt;
@@ -65,6 +71,8 @@ ENTRY_FUNCTION(start_phytec_pbab01_1gib, r0, r1, r2)
 
 	arm_setup_stack(0x00920000 - 8);
 
+	IMD_USED(phyflex_mx6_memsize_1G);
+
 	if (IS_ENABLED(CONFIG_DEBUG_LL))
 		setup_uart();
 
@@ -81,6 +89,8 @@ ENTRY_FUNCTION(start_phytec_pbab01_2gib, r0, r1, r2)
 
 	arm_setup_stack(0x00920000 - 8);
 
+	IMD_USED(phyflex_mx6_memsize_2G);
+
 	if (IS_ENABLED(CONFIG_DEBUG_LL))
 		setup_uart();
 
@@ -97,6 +107,8 @@ ENTRY_FUNCTION(start_phytec_pbab01_4gib, r0, r1, r2)
 
 	arm_setup_stack(0x00920000 - 8);
 
+	IMD_USED(phyflex_mx6_memsize_4G);
+
 	fdt = __dtb_imx6q_phytec_pbab01_start - get_runtime_offset();
 
 	barebox_arm_entry(0x10000000, 0xEFFFFFF8, fdt);
@@ -110,6 +122,8 @@ ENTRY_FUNCTION(start_phytec_pbab01dl_1gib, r0, r1, r2)
 
 	arm_setup_stack(0x00920000 - 8);
 
+	IMD_USED(phyflex_mx6_memsize_1G);
+
 	fdt = __dtb_imx6dl_phytec_pbab01_start - get_runtime_offset();
 
 	barebox_arm_entry(0x10000000, SZ_1G, fdt);
@@ -123,6 +137,8 @@ ENTRY_FUNCTION(start_phytec_pbab01s_512mb, r0, r1, r2)
 
 	arm_setup_stack(0x00920000 - 8);
 
+	IMD_USED(phyflex_mx6_memsize_512M);
+
 	fdt = __dtb_imx6s_phytec_pbab01_start - get_runtime_offset();
 
 	barebox_arm_entry(0x10000000, SZ_512M, fdt);
diff --git a/arch/arm/boards/tqma53/lowlevel.c b/arch/arm/boards/tqma53/lowlevel.c
index 0a67228008..cd87212555 100644
--- a/arch/arm/boards/tqma53/lowlevel.c
+++ b/arch/arm/boards/tqma53/lowlevel.c
@@ -5,6 +5,7 @@
 #include <asm/barebox-arm-head.h>
 #include <asm/barebox-arm.h>
 #include <mach/imx5.h>
+#include <image-metadata.h>
 
 extern char __dtb_imx53_mba53_start[];
 
@@ -34,6 +35,8 @@ static void __noreturn start_imx53_tqma53_common(void *fdt)
 	imx53_barebox_entry(fdt);
 }
 
+BAREBOX_IMD_TAG_STRING(tqma53_memsize_512M, IMD_TYPE_PARAMETER, "memsize=512", 0);
+
 ENTRY_FUNCTION(start_imx53_mba53_512mib, r0, r1, r2)
 {
 	void *fdt;
@@ -42,6 +45,8 @@ ENTRY_FUNCTION(start_imx53_mba53_512mib, r0, r1, r2)
 
 	arm_setup_stack(0xf8020000 - 8);
 
+	IMD_USED(tqma53_memsize_512M);
+
 	imx53_init_lowlevel_early(800);
 
 	fdt = __dtb_imx53_mba53_start - get_runtime_offset();
@@ -49,6 +54,8 @@ ENTRY_FUNCTION(start_imx53_mba53_512mib, r0, r1, r2)
 	start_imx53_tqma53_common(fdt);
 }
 
+BAREBOX_IMD_TAG_STRING(tqma53_memsize_1G, IMD_TYPE_PARAMETER, "memsize=1024", 0);
+
 ENTRY_FUNCTION(start_imx53_mba53_1gib, r0, r1, r2)
 {
 	void *fdt;
@@ -57,6 +64,8 @@ ENTRY_FUNCTION(start_imx53_mba53_1gib, r0, r1, r2)
 
 	arm_setup_stack(0xf8020000 - 8);
 
+	IMD_USED(tqma53_memsize_1G);
+
 	imx53_init_lowlevel_early(800);
 
 	fdt = __dtb_imx53_mba53_start - get_runtime_offset();
diff --git a/arch/arm/lib/barebox.lds.S b/arch/arm/lib/barebox.lds.S
index d9588736f8..bb0354ae29 100644
--- a/arch/arm/lib/barebox.lds.S
+++ b/arch/arm/lib/barebox.lds.S
@@ -75,6 +75,8 @@ SECTIONS
 	. = ALIGN(4);
 	.data : { *(.data*) }
 
+	.barebox_imd : { BAREBOX_IMD }
+
 	. = .;
 	__barebox_cmd_start = .;
 	.barebox_cmd : { BAREBOX_CMDS }
diff --git a/arch/arm/lib/pbl.lds.S b/arch/arm/lib/pbl.lds.S
index 76184a0eec..9afee2964a 100644
--- a/arch/arm/lib/pbl.lds.S
+++ b/arch/arm/lib/pbl.lds.S
@@ -54,6 +54,8 @@ SECTIONS
 	. = ALIGN(4);
 	.rodata : { *(.rodata*) }
 
+	.barebox_imd : { BAREBOX_IMD }
+
 	_etext = .;			/* End of text and rodata section */
 
 	. = ALIGN(4);