[U-Boot] [PATCH v2 1/7] microblaze: Add support for device tree driven board configuration
Michal Simek
monstr at monstr.eu
Mon Aug 6 09:46:33 CEST 2012
This is minimum code required to be able to use device-tree
for u-boot initialization.
Currently only for device driver initialization.
Linker script change ensures DTB to be aligned
for both options CONFIG_OF_EMBED and CONFIG_OF_SEPARATE.
Signed-off-by: Michal Simek <monstr at monstr.eu>
CC: Simon Glass <sjg at chromium.org>
---
v2: Show message about DTB address in bootlog
---
arch/microblaze/config.mk | 2 ++
arch/microblaze/cpu/u-boot.lds | 1 +
arch/microblaze/include/asm/global_data.h | 1 +
arch/microblaze/lib/board.c | 24 ++++++++++++++++++++++++
4 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/arch/microblaze/config.mk b/arch/microblaze/config.mk
index aca79e2..b4935f0 100644
--- a/arch/microblaze/config.mk
+++ b/arch/microblaze/config.mk
@@ -31,3 +31,5 @@ CONFIG_STANDALONE_LOAD_ADDR ?= 0x80F00000
PLATFORM_CPPFLAGS += -ffixed-r31 -D__microblaze__
LDSCRIPT ?= $(SRCTREE)/$(CPUDIR)/u-boot.lds
+
+CONFIG_ARCH_DEVICE_TREE := microblaze
diff --git a/arch/microblaze/cpu/u-boot.lds b/arch/microblaze/cpu/u-boot.lds
index ee41145..d033a28 100644
--- a/arch/microblaze/cpu/u-boot.lds
+++ b/arch/microblaze/cpu/u-boot.lds
@@ -45,6 +45,7 @@ SECTIONS
.data ALIGN(0x4):
{
__data_start = .;
+ dts/libdts.o (.data)
*(.data)
__data_end = .;
}
diff --git a/arch/microblaze/include/asm/global_data.h b/arch/microblaze/include/asm/global_data.h
index 6e8537c..e802e4e 100644
--- a/arch/microblaze/include/asm/global_data.h
+++ b/arch/microblaze/include/asm/global_data.h
@@ -43,6 +43,7 @@ typedef struct global_data {
unsigned long precon_buf_idx; /* Pre-Console buffer index */
#endif
unsigned long env_addr; /* Address of Environment struct */
+ const void *fdt_blob; /* Our device tree, NULL if none */
unsigned long env_valid; /* Checksum of Environment valid? */
unsigned long fb_base; /* base address of frame buffer */
void **jt; /* jump table */
diff --git a/arch/microblaze/lib/board.c b/arch/microblaze/lib/board.c
index b80250a..942e18c 100644
--- a/arch/microblaze/lib/board.c
+++ b/arch/microblaze/lib/board.c
@@ -34,6 +34,7 @@
#include <net.h>
#include <asm/processor.h>
#include <asm/microblaze_intc.h>
+#include <fdtdec.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -63,6 +64,9 @@ typedef int (init_fnc_t) (void);
init_fnc_t *init_sequence[] = {
env_init,
+#ifdef CONFIG_OF_CONTROL
+ fdtdec_check_fdt,
+#endif
serial_init,
console_init_f,
#ifdef CONFIG_SYS_GPIO_0
@@ -103,6 +107,17 @@ void board_init (void)
monitor_flash_len = __end - __text_start;
+#ifdef CONFIG_OF_EMBED
+ /* Get a pointer to the FDT */
+ gd->fdt_blob = _binary_dt_dtb_start;
+#elif defined CONFIG_OF_SEPARATE
+ /* FDT is at end of image */
+ gd->fdt_blob = (void *)__end;
+#endif
+ /* Allow the early environment to override the fdt address */
+ gd->fdt_blob = (void *)getenv_ulong("fdtcontroladdr", 16,
+ (uintptr_t)gd->fdt_blob);
+
/*
* The Malloc area is immediately below the monitor copy in DRAM
* aka CONFIG_SYS_MONITOR_BASE - Note there is no need for reloc_off
@@ -121,6 +136,15 @@ void board_init (void)
}
}
+#ifdef CONFIG_OF_CONTROL
+ /* For now, put this check after the console is ready */
+ if (fdtdec_prepare_fdt()) {
+ panic("** CONFIG_OF_CONTROL defined but no FDT - please see "
+ "doc/README.fdt-control");
+ } else
+ printf("DTB: 0x%x\n", (u32)gd->fdt_blob);
+#endif
+
puts ("SDRAM :\n");
printf ("\t\tIcache:%s\n", icache_status() ? "ON" : "OFF");
printf ("\t\tDcache:%s\n", dcache_status() ? "ON" : "OFF");
--
1.7.0.4
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