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authorSimon Glass <sjg@chromium.org>2013-02-28 19:26:15 +0000
committerSimon Glass <sjg@chromium.org>2013-03-04 15:57:47 -0800
commitf697d528caba0c30382b7269fd36f1111e51810d (patch)
treed2dceffbd191c1e1a3481c06a32597af9d580a98
parentf82d15ead1badc329c4c804f0405e32289f46dd8 (diff)
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x86: Support relocation of FDT on start-up
With CONFIG_OF_CONTROL we may have an FDT in the BSS region. Relocate it up with the rest of U-Boot to keep the rest of memory free. Signed-off-by: Simon Glass <sjg@chromium.org>
-rw-r--r--arch/x86/include/asm/global_data.h1
-rw-r--r--arch/x86/include/asm/init_helpers.h2
-rw-r--r--arch/x86/include/asm/relocate.h1
-rw-r--r--arch/x86/lib/board.c3
-rw-r--r--arch/x86/lib/init_helpers.c23
-rw-r--r--arch/x86/lib/init_wrappers.c1
-rw-r--r--arch/x86/lib/relocate.c17
7 files changed, 46 insertions, 2 deletions
diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h
index 2f84abd..4fdb080 100644
--- a/arch/x86/include/asm/global_data.h
+++ b/arch/x86/include/asm/global_data.h
@@ -32,6 +32,7 @@ struct arch_global_data {
uint64_t tsc_base; /* Initial value returned by rdtsc() */
uint32_t tsc_base_kclocks; /* Initial tsc as a kclocks value */
uint32_t tsc_prev; /* For show_boot_progress() */
+ void *new_fdt; /* Relocated FDT */
};
#endif
diff --git a/arch/x86/include/asm/init_helpers.h b/arch/x86/include/asm/init_helpers.h
index 2f437e0..d018b29 100644
--- a/arch/x86/include/asm/init_helpers.h
+++ b/arch/x86/include/asm/init_helpers.h
@@ -38,5 +38,7 @@ int flash_init_r(void);
int status_led_set_r(void);
int set_load_addr_r(void);
int init_func_spi(void);
+int find_fdt(void);
+int prepare_fdt(void);
#endif /* !_INIT_HELPERS_H_ */
diff --git a/arch/x86/include/asm/relocate.h b/arch/x86/include/asm/relocate.h
index 33129ef..d371c9d 100644
--- a/arch/x86/include/asm/relocate.h
+++ b/arch/x86/include/asm/relocate.h
@@ -27,6 +27,7 @@
#include <common.h>
int copy_uboot_to_ram(void);
+int copy_fdt_to_ram(void);
int clear_bss(void);
int do_elf_reloc_fixups(void);
diff --git a/arch/x86/lib/board.c b/arch/x86/lib/board.c
index 22bc26d..2441a66 100644
--- a/arch/x86/lib/board.c
+++ b/arch/x86/lib/board.c
@@ -32,6 +32,7 @@
*/
#include <common.h>
+#include <fdtdec.h>
#include <watchdog.h>
#include <stdio_dev.h>
#include <asm/u-boot-x86.h>
@@ -131,6 +132,7 @@ init_fnc_t *init_sequence_f[] = {
init_fnc_t *init_sequence_f_r[] = {
init_cache_f_r,
copy_uboot_to_ram,
+ copy_fdt_to_ram,
clear_bss,
do_elf_reloc_fixups,
@@ -217,6 +219,7 @@ static void do_init_loop(init_fnc_t **init_fnc_ptr)
void board_init_f(ulong boot_flags)
{
+ gd->fdt_blob = gd->arch.new_fdt = NULL;
gd->flags = boot_flags;
do_init_loop(init_sequence_f);
diff --git a/arch/x86/lib/init_helpers.c b/arch/x86/lib/init_helpers.c
index ff2d21f..414fdcc 100644
--- a/arch/x86/lib/init_helpers.c
+++ b/arch/x86/lib/init_helpers.c
@@ -22,6 +22,7 @@
*/
#include <common.h>
#include <command.h>
+#include <fdtdec.h>
#include <stdio_dev.h>
#include <version.h>
#include <malloc.h>
@@ -85,17 +86,35 @@ int calculate_relocation_address(void)
(uintptr_t)&__text_start;
ulong total_size;
ulong dest_addr;
+ ulong fdt_size = 0;
+#if defined(CONFIG_OF_SEPARATE) && defined(CONFIG_OF_CONTROL)
+ if (gd->fdt_blob)
+ fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob) + 0x1000, 32);
+#endif
total_size = ALIGN(uboot_size, 1 << 12) + CONFIG_SYS_MALLOC_LEN +
- CONFIG_SYS_STACK_SIZE;
+ CONFIG_SYS_STACK_SIZE + fdt_size;
+ dest_addr = board_get_usable_ram_top(total_size);
/*
* NOTE: All destination address are rounded down to 16-byte
* boundary to satisfy various worst-case alignment
* requirements
*/
- dest_addr = board_get_usable_ram_top(total_size);
+ dest_addr &= ~15;
+#if defined(CONFIG_OF_SEPARATE) && defined(CONFIG_OF_CONTROL)
+ /*
+ * If the device tree is sitting immediate above our image then we
+ * must relocate it. If it is embedded in the data section, then it
+ * will be relocated with other data.
+ */
+ if (gd->fdt_blob) {
+ dest_addr -= fdt_size;
+ gd->arch.new_fdt = (void *)dest_addr;
+ dest_addr &= ~15;
+ }
+#endif
/* U-Boot is below the FDT */
dest_addr -= uboot_size;
dest_addr &= ~((1 << 12) - 1);
diff --git a/arch/x86/lib/init_wrappers.c b/arch/x86/lib/init_wrappers.c
index cca018f..19af875 100644
--- a/arch/x86/lib/init_wrappers.c
+++ b/arch/x86/lib/init_wrappers.c
@@ -22,6 +22,7 @@
*/
#include <common.h>
#include <environment.h>
+#include <fdtdec.h>
#include <serial.h>
#include <kgdb.h>
#include <scsi.h>
diff --git a/arch/x86/lib/relocate.c b/arch/x86/lib/relocate.c
index 23edca9..3a38e52 100644
--- a/arch/x86/lib/relocate.c
+++ b/arch/x86/lib/relocate.c
@@ -32,6 +32,7 @@
*/
#include <common.h>
+#include <libfdt.h>
#include <malloc.h>
#include <asm/u-boot-x86.h>
#include <asm/relocate.h>
@@ -46,6 +47,22 @@ int copy_uboot_to_ram(void)
return 0;
}
+int copy_fdt_to_ram(void)
+{
+ if (gd->arch.new_fdt) {
+ ulong fdt_size;
+
+ fdt_size = ALIGN(fdt_totalsize(gd->fdt_blob) + 0x1000, 32);
+
+ memcpy(gd->arch.new_fdt, gd->fdt_blob, fdt_size);
+ debug("Relocated fdt from %p to %p, size %lx\n",
+ gd->fdt_blob, gd->arch.new_fdt, fdt_size);
+ gd->fdt_blob = gd->arch.new_fdt;
+ }
+
+ return 0;
+}
+
int clear_bss(void)
{
ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;