mpc5200: Add SPL support

[pandora-u-boot.git] / arch / powerpc / cpu / mpc5xxx / spl_boot.c

diff --git a/arch/powerpc/cpu/mpc5xxx/spl_boot.c b/arch/powerpc/cpu/mpc5xxx/spl_boot.c
new file mode 100644 (file)
index 0000000..9f14127
--- /dev/null
+++ b/arch/powerpc/cpu/mpc5xxx/spl_boot.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2012 Stefan Roese <sr@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.         See the
+ * GNU General Public License for more details.
+ */
+
+#include <common.h>
+#include <spl.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Needed to align size SPL image to a 4-byte length
+ */
+u32 end_align __attribute__ ((section(".end_align")));
+
+/*
+ * Return selected boot device. On MPC5200 its only NOR flash right now.
+ */
+u32 spl_boot_device(void)
+{
+       return BOOT_DEVICE_NOR;
+}
+
+/*
+ * SPL version of board_init_f()
+ */
+void board_init_f(ulong bootflag)
+{
+       end_align = (u32)__spl_flash_end;
+
+       /*
+        * First we need to initialize the SDRAM, so that the real
+        * U-Boot or the OS (Linux) can be loaded
+        */
+       initdram(0);
+
+       /* Clear bss */
+       memset(__bss_start, '\0', __bss_end__ - __bss_start);
+
+       /*
+        * Init global_data pointer. Has to be done before calling
+        * get_clocks(), as it stores some clock values into gd needed
+        * later on in the serial driver.
+        */
+       /* Pointer is writable since we allocated a register for it */
+       gd = (gd_t *)(CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
+       /* Clear initial global data */
+       memset((void *)gd, 0, sizeof(gd_t));
+
+       /*
+        * get_clocks() needs to be called so that the serial driver
+        * works correctly
+        */
+       get_clocks();
+
+       /*
+        * Do rudimental console / serial setup
+        */
+       preloader_console_init();
+
+       /*
+        * Call board_init_r() (SPL framework version) to load and boot
+        * real U-Boot or OS
+        */
+       board_init_r(NULL, 0);
+       /* Does not return!!! */
+}