[U-Boot] [PATCH v2 19/23] SPL: read and store arch property from U-Boot image

[Andre Przywara <andre.przywara@arm.com>]

Read the specified "arch" value from a legacy or FIT U-Boot image and
store it in our SPL data structure.
This allows loaders to take the target architecture in account for
custom loading procedures.
Having the complete string -> arch mapping for FIT based images in the
SPL would be too big, so we leave it up to architectures (or boards) to
overwrite the weak function that does the actual translation, possibly
covering only the required subset there.
Document struct spl_image_info on the way.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 common/spl/spl.c     |  1 +
 common/spl/spl_fit.c |  8 ++++++++
 include/spl.h        | 15 ++++++++++++++-
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/common/spl/spl.c b/common/spl/spl.c
index cda2f8a..b457052 100644
--- a/common/spl/spl.c
+++ b/common/spl/spl.c
@@ -114,6 +114,7 @@ int spl_parse_image_header(struct spl_image_info *spl_image,
 				header_size;
 		}
 		spl_image->os = image_get_os(header);
+		spl_image->arch = image_get_arch(header);
 		spl_image->name = image_get_name(header);
 		debug("spl: payload image: %.*s load addr: 0x%lx size: %d\n",
 			(int)sizeof(spl_image->name), spl_image->name,
diff --git a/common/spl/spl_fit.c b/common/spl/spl_fit.c
index aae556f..a5d903b 100644
--- a/common/spl/spl_fit.c
+++ b/common/spl/spl_fit.c
@@ -123,6 +123,11 @@ static int get_aligned_image_size(struct spl_load_info *info, int data_size,
 	return (data_size + info->bl_len - 1) / info->bl_len;
 }
 
+__weak u8 spl_genimg_get_arch_id(const char *arch_str)
+{
+	return IH_ARCH_DEFAULT;
+}
+
 int spl_load_simple_fit(struct spl_image_info *spl_image,
 			struct spl_load_info *info, ulong sector, void *fit)
 {
@@ -136,6 +141,7 @@ int spl_load_simple_fit(struct spl_image_info *spl_image,
 	int base_offset, align_len = ARCH_DMA_MINALIGN - 1;
 	int src_sector;
 	void *dst, *src;
+	const char *arch_str;
 
 	/*
 	 * Figure out where the external images start. This is the base for the
@@ -184,10 +190,12 @@ int spl_load_simple_fit(struct spl_image_info *spl_image,
 	data_offset = fdt_getprop_u32(fit, node, "data-offset");
 	data_size = fdt_getprop_u32(fit, node, "data-size");
 	load = fdt_getprop_u32(fit, node, "load");
+	arch_str = fdt_getprop(fit, node, "arch", NULL);
 	debug("data_offset=%x, data_size=%x\n", data_offset, data_size);
 	spl_image->load_addr = load;
 	spl_image->entry_point = load;
 	spl_image->os = IH_OS_U_BOOT;
+	spl_image->arch = spl_genimg_get_arch_id(arch_str);
 
 	/*
 	 * Work out where to place the image. We read it so that the first
diff --git a/include/spl.h b/include/spl.h
index feadb33..87129df 100644
--- a/include/spl.h
+++ b/include/spl.h
@@ -20,13 +20,26 @@
 #define MMCSD_MODE_FS		2
 #define MMCSD_MODE_EMMCBOOT	3
 
+/*
+ * Information about an U-Boot image file as described in include/image.h.
+ * Parsed by the SPL code from a legacy or FIT image file.
+ *
+ * @name: descriptive string (mkimage -n)
+ * @load_addr: address to load the image file to (mkimage -a)
+ * @entry_point: address of first instruction to execute (mkimage -e)
+ * @size: size of image in bytes
+ * @flags: optional, used only for SPL_COPY_PAYLOAD_ONLY so far
+ * @os: target operating system, one of IH_OS_* (mkimage -O)
+ * @arch: target architecture, one of IH_ARCH_* (mkimage -A)
+ */
 struct spl_image_info {
 	const char *name;
-	u8 os;
 	ulong load_addr;
 	ulong entry_point;
 	u32 size;
 	u32 flags;
+	u8 os;
+	u8 arch;
 };
 
 /*
-- 
2.8.2