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-rw-r--r--common/board_f.c83
1 files changed, 81 insertions, 2 deletions
diff --git a/common/board_f.c b/common/board_f.c
index 1721eed..29b49c3 100644
--- a/common/board_f.c
+++ b/common/board_f.c
@@ -57,6 +57,10 @@
#include <asm/mp.h>
#endif
#include <asm/sections.h>
+#ifdef CONFIG_X86
+#include <asm/init_helpers.h>
+#include <asm/relocate.h>
+#endif
#include <linux/compiler.h>
/*
@@ -423,7 +427,7 @@ static int reserve_lcd(void)
#endif /* CONFIG_LCD */
#if defined(CONFIG_VIDEO) && (!defined(CONFIG_PPC) || defined(CONFIG_8xx)) \
- && !defined(CONFIG_ARM)
+ && !defined(CONFIG_ARM) && !defined(CONFIG_X86)
static int reserve_video(void)
{
/* reserve memory for video display (always full pages) */
@@ -716,7 +720,25 @@ static int setup_reloc(void)
static int jump_to_copy(void)
{
+ /*
+ * x86 is special, but in a nice way. It uses a trampoline which
+ * enables the dcache if possible.
+ *
+ * For now, other archs use relocate_code(), which is implemented
+ * similarly for all archs. When we do generic relocation, hopefully
+ * we can make all archs enable the dcache prior to relocation.
+ */
+#ifdef CONFIG_X86
+ /*
+ * SDRAM and console are now initialised. The final stack can now
+ * be setup in SDRAM. Code execution will continue in Flash, but
+ * with the stack in SDRAM and Global Data in temporary memory
+ * (CPU cache)
+ */
+ board_init_f_r_trampoline(gd->start_addr_sp);
+#else
relocate_code(gd->dest_addr_sp, gd->new_gd, gd->dest_addr);
+#endif
return 0;
}
@@ -743,6 +765,12 @@ static init_fnc_t init_sequence_f[] = {
probecpu,
#endif
arch_cpu_init, /* basic arch cpu dependent setup */
+#ifdef CONFIG_X86
+ cpu_init_f, /* TODO(sjg@chromium.org): remove */
+# ifdef CONFIG_OF_CONTROL
+ find_fdt, /* TODO(sjg@chromium.org): remove */
+# endif
+#endif
mark_bootstage,
#ifdef CONFIG_OF_CONTROL
fdtdec_check_fdt,
@@ -791,6 +819,9 @@ static init_fnc_t init_sequence_f[] = {
init_baud_rate, /* initialze baudrate settings */
serial_init, /* serial communications setup */
console_init_f, /* stage 1 init of console */
+#if defined(CONFIG_X86) && defined(CONFIG_OF_CONTROL)
+ prepare_fdt, /* TODO(sjg@chromium.org): remove */
+#endif
display_options, /* say that we are here */
display_text_info, /* show debugging info if required */
#if defined(CONFIG_8260)
@@ -828,6 +859,8 @@ static init_fnc_t init_sequence_f[] = {
#endif
#ifdef CONFIG_X86
dram_init_f, /* configure available RAM banks */
+ /* x86 would prefer that this happens after relocation */
+ dram_init,
#endif
announce_dram_init,
/* TODO: unify all these dram functions? */
@@ -879,7 +912,7 @@ static init_fnc_t init_sequence_f[] = {
#endif
/* TODO: Why the dependency on CONFIG_8xx? */
#if defined(CONFIG_VIDEO) && (!defined(CONFIG_PPC) || defined(CONFIG_8xx)) \
- && !defined(CONFIG_ARM)
+ && !defined(CONFIG_ARM) && !defined(CONFIG_X86)
reserve_video,
#endif
reserve_uboot,
@@ -914,9 +947,11 @@ static init_fnc_t init_sequence_f[] = {
void board_init_f(ulong boot_flags)
{
+#ifndef CONFIG_X86
gd_t data;
gd = &data;
+#endif
gd->flags = boot_flags;
@@ -929,6 +964,50 @@ void board_init_f(ulong boot_flags)
#endif
}
+#ifdef CONFIG_X86
+/*
+ * For now this code is only used on x86.
+ *
+ * init_sequence_f_r is the list of init functions which are run when
+ * U-Boot is executing from Flash with a semi-limited 'C' environment.
+ * The following limitations must be considered when implementing an
+ * '_f_r' function:
+ * - 'static' variables are read-only
+ * - Global Data (gd->xxx) is read/write
+ *
+ * The '_f_r' sequence must, as a minimum, copy U-Boot to RAM (if
+ * supported). It _should_, if possible, copy global data to RAM and
+ * initialise the CPU caches (to speed up the relocation process)
+ *
+ * NOTE: At present only x86 uses this route, but it is intended that
+ * all archs will move to this when generic relocation is implemented.
+ */
+static init_fnc_t init_sequence_f_r[] = {
+ init_cache_f_r,
+ copy_uboot_to_ram,
+ clear_bss,
+ do_elf_reloc_fixups,
+
+ NULL,
+};
+
+void board_init_f_r(void)
+{
+ if (initcall_run_list(init_sequence_f_r))
+ hang();
+
+ /*
+ * U-Boot has been copied into SDRAM, the BSS has been cleared etc.
+ * Transfer execution from Flash to RAM by calculating the address
+ * of the in-RAM copy of board_init_r() and calling it
+ */
+ (board_init_r + gd->reloc_off)(gd, gd->relocaddr);
+
+ /* NOTREACHED - board_init_r() does not return */
+ hang();
+}
+#endif /* CONFIG_X86 */
+
void hang(void)
{
puts("### ERROR ### Please RESET the board ###\n");