AVR32: Relocate u-boot to SDRAM
Relocate the u-boot image into SDRAM like everyone else does. This
means that we can handle much larger .data and .bss than we used to.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
diff --git a/lib_avr32/board.c b/lib_avr32/board.c
index 12d0b97..c55ebd5 100644
--- a/lib_avr32/board.c
+++ b/lib_avr32/board.c
@@ -47,11 +47,14 @@
static unsigned long mem_malloc_end = 0;
static unsigned long mem_malloc_brk = 0;
-/* The malloc area is wherever the board wants it to be */
+/* The malloc area is right below the monitor image in RAM */
static void mem_malloc_init(void)
{
- mem_malloc_start = CFG_MALLOC_START;
- mem_malloc_end = CFG_MALLOC_END;
+ unsigned long monitor_addr;
+
+ monitor_addr = CFG_MONITOR_BASE + gd->reloc_off;
+ mem_malloc_end = monitor_addr;
+ mem_malloc_start = mem_malloc_end - CFG_MALLOC_LEN;
mem_malloc_brk = mem_malloc_start;
printf("malloc: Using memory from 0x%08lx to 0x%08lx\n",
@@ -125,6 +128,12 @@
void board_init_f(ulong unused)
{
gd_t gd_data;
+ gd_t *new_gd;
+ bd_t *bd;
+ unsigned long *new_sp;
+ unsigned long monitor_len;
+ unsigned long monitor_addr;
+ unsigned long addr;
/* Initialize the global data pointer */
memset(&gd_data, 0, sizeof(gd_data));
@@ -133,7 +142,6 @@
/* Perform initialization sequence */
board_early_init_f();
cpu_init();
- timer_init();
env_init();
init_baudrate();
serial_init();
@@ -141,28 +149,120 @@
display_banner();
board_init_memories();
- board_init_r(gd, CFG_MONITOR_BASE);
+ /* If we have no SDRAM, we can't go on */
+ if (!gd->sdram_size)
+ panic("No working SDRAM available\n");
+
+ /*
+ * Now that we have DRAM mapped and working, we can
+ * relocate the code and continue running from DRAM.
+ *
+ * Reserve memory at end of RAM for (top down in that order):
+ * - u-boot image
+ * - heap for malloc()
+ * - board info struct
+ * - global data struct
+ * - stack
+ */
+ addr = CFG_SDRAM_BASE + gd->sdram_size;
+ monitor_len = _end - _text;
+
+ /*
+ * Reserve memory for u-boot code, data and bss.
+ * Round down to next 4 kB limit.
+ */
+ addr -= monitor_len;
+ addr &= ~(4096UL - 1);
+ monitor_addr = addr;
+
+ /* Reserve memory for malloc() */
+ addr -= CFG_MALLOC_LEN;
+
+ /* Allocate a Board Info struct on a word boundary */
+ addr -= sizeof(bd_t);
+ addr &= ~3UL;
+ gd->bd = bd = (bd_t *)addr;
+
+ /* Allocate a new global data copy on a 8-byte boundary. */
+ addr -= sizeof(gd_t);
+ addr &= ~7UL;
+ new_gd = (gd_t *)addr;
+
+ /* And finally, a new, bigger stack. */
+ new_sp = (unsigned long *)addr;
+ gd->stack_end = addr;
+ *(--new_sp) = 0;
+ *(--new_sp) = 0;
+
+ /*
+ * Initialize the board information struct with the
+ * information we have.
+ */
+ bd->bi_dram[0].start = CFG_SDRAM_BASE;
+ bd->bi_dram[0].size = gd->sdram_size;
+ bd->bi_baudrate = gd->baudrate;
+
+ memcpy(new_gd, gd, sizeof(gd_t));
+
+ relocate_code((unsigned long)new_sp, new_gd, monitor_addr);
}
void board_init_r(gd_t *new_gd, ulong dest_addr)
{
+ extern void malloc_bin_reloc (void);
+#ifndef CFG_ENV_IS_NOWHERE
+ extern char * env_name_spec;
+#endif
+ cmd_tbl_t *cmdtp;
+ bd_t *bd;
+
gd = new_gd;
+ bd = gd->bd;
+
+ gd->flags |= GD_FLG_RELOC;
+ gd->reloc_off = dest_addr - CFG_MONITOR_BASE;
monitor_flash_len = _edata - _text;
- mem_malloc_init();
- gd->bd = malloc(sizeof(bd_t));
- memset(gd->bd, 0, sizeof(bd_t));
- gd->bd->bi_baudrate = gd->baudrate;
- gd->bd->bi_dram[0].start = CFG_SDRAM_BASE;
- gd->bd->bi_dram[0].size = gd->sdram_size;
+ /*
+ * We have to relocate the command table manually
+ */
+ for (cmdtp = &__u_boot_cmd_start;
+ cmdtp != &__u_boot_cmd_end; cmdtp++) {
+ unsigned long addr;
+ addr = (unsigned long)cmdtp->cmd + gd->reloc_off;
+ cmdtp->cmd = (typeof(cmdtp->cmd))addr;
+
+ addr = (unsigned long)cmdtp->name + gd->reloc_off;
+ cmdtp->name = (typeof(cmdtp->name))addr;
+
+ if (cmdtp->usage) {
+ addr = (unsigned long)cmdtp->usage + gd->reloc_off;
+ cmdtp->usage = (typeof(cmdtp->usage))addr;
+ }
+#ifdef CFG_LONGHELP
+ if (cmdtp->help) {
+ addr = (unsigned long)cmdtp->help + gd->reloc_off;
+ cmdtp->help = (typeof(cmdtp->help))addr;
+ }
+#endif
+ }
+
+ /* there are some other pointer constants we must deal with */
+#ifndef CFG_ENV_IS_NOWHERE
+ env_name_spec += gd->reloc_off;
+#endif
+
+ timer_init();
+ mem_malloc_init();
+ malloc_bin_reloc();
board_init_info();
flash_init();
- if (gd->bd->bi_flashsize)
+ if (bd->bi_flashsize)
display_flash_config();
- if (gd->bd->bi_dram[0].size)
+ if (bd->bi_dram[0].size)
display_dram_config();
gd->bd->bi_boot_params = malloc(CFG_BOOTPARAMS_LEN);