This adds a device tree pointer to the global data. It can be set by
board code. A later commit will add support for making a device
tree binary blob available to U-Boot for run-time configuration.
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v3:
- Rename gd->blob to gd->fdt_blob
Changes in v4:
- Fix reference to gd->blob which should be gd->fdt_blob
README | 11 +++++++++++
arch/arm/include/asm/global_data.h | 1 +
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/README b/README
index c6b179c..f424b28 100644
--- a/README
+++ b/README
@@ -815,6 +815,17 @@ The following options need to be configured:
XXX - this list needs to get updated!
+- Device tree:
+ CONFIG_OF_CONTROL
+ If this variable is defined, U-Boot will use a device tree
+ to configure its devices, instead of relying on statically
+ compiled #defines in the board file. This option is
+ experimental and only available on a few boards. The device
+ tree is available in the global data as gd->fdt_blob.
+
+ U-Boot needs to get its device tree from somewhere. This will
+ be enabled in a future patch.
+
- Watchdog:
CONFIG_WATCHDOG
If this variable is defined, it enables watchdog
diff --git a/arch/arm/include/asm/global_data.h
b/arch/arm/include/asm/global_data.h
index fac98d5..c3ff789 100644
--- a/arch/arm/include/asm/global_data.h
+++ b/arch/arm/include/asm/global_data.h
@@ -76,6 +76,7 @@ typedef struct global_data {
#if !(defined(CONFIG_SYS_ICACHE_OFF) && defined(CONFIG_SYS_DCACHE_OFF))
unsigned long tlb_addr;
#endif
+ const void *fdt_blob; /* Our device tree, NULL if none */
void **jt; /* jump table */
char env_buf[32]; /* buffer for getenv() before reloc. */
#if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER)
--
1.7.3.1
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