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fdt: ARM: Add device tree control of U-Boot (CONFIG_OF_CONTROL)

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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 <sjg@chromium.org>
This commit is contained in:
Simon Glass 2011-10-15 05:48:20 +00:00 committed by Wolfgang Denk
parent 2d46cf291e
commit 45ba8077f3
2 changed files with 12 additions and 0 deletions
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11
README
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@ -816,6 +816,17 @@ 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

1
arch/arm/include/asm/global_data.h
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@ -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)