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authorChristian Riesch <christian.riesch@omicron.at>2011-12-09 09:47:35 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2011-12-24 10:23:30 +0100
commit32b1127397a305ae0bc0a55ed9c4421fb570ef78 (patch)
tree5b473b2218b4ec0047485f5ada367ede3c00198c /drivers/mtd/spi
parent7029a24f2cb50ce673eca07cf3982d8357d5a6ec (diff)
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sf: Add spi_boot() to allow booting from SPI flash in an SPL
Signed-off-by: Christian Riesch <christian.riesch@omicron.at> Cc: Heiko Schocher <hs@denx.de> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Scott Wood <scottwood@freescale.com> Acked-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'drivers/mtd/spi')
-rw-r--r--drivers/mtd/spi/Makefile4
-rw-r--r--drivers/mtd/spi/spi_spl_load.c58
2 files changed, 62 insertions, 0 deletions
diff --git a/drivers/mtd/spi/Makefile b/drivers/mtd/spi/Makefile
index 57112af..90f8392 100644
--- a/drivers/mtd/spi/Makefile
+++ b/drivers/mtd/spi/Makefile
@@ -25,6 +25,10 @@ include $(TOPDIR)/config.mk
LIB := $(obj)libspi_flash.o
+ifdef CONFIG_SPL_BUILD
+COBJS-$(CONFIG_SPL_SPI_LOAD) += spi_spl_load.o
+endif
+
COBJS-$(CONFIG_SPI_FLASH) += spi_flash.o
COBJS-$(CONFIG_SPI_FLASH_ATMEL) += atmel.o
COBJS-$(CONFIG_SPI_FLASH_EON) += eon.o
diff --git a/drivers/mtd/spi/spi_spl_load.c b/drivers/mtd/spi/spi_spl_load.c
new file mode 100644
index 0000000..1aa30ac
--- /dev/null
+++ b/drivers/mtd/spi/spi_spl_load.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2011 OMICRON electronics GmbH
+ *
+ * based on drivers/mtd/nand/nand_spl_load.c
+ *
+ * Copyright (C) 2011
+ * Heiko Schocher, DENX Software Engineering, hs@denx.de.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <spi_flash.h>
+
+/*
+ * The main entry for SPI booting. It's necessary that SDRAM is already
+ * configured and available since this code loads the main U-Boot image
+ * from SPI into SDRAM and starts it from there.
+ */
+void spi_boot(void)
+{
+ struct spi_flash *flash;
+ void (*uboot)(void) __noreturn;
+
+ /*
+ * Load U-Boot image from SPI flash into RAM
+ */
+
+ flash = spi_flash_probe(CONFIG_SPL_SPI_BUS, CONFIG_SPL_SPI_CS,
+ CONFIG_SF_DEFAULT_SPEED, SPI_MODE_3);
+ if (!flash) {
+ puts("failed.\n");
+ hang();
+ }
+
+ spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
+ CONFIG_SYS_SPI_U_BOOT_SIZE,
+ (void *) CONFIG_SYS_TEXT_BASE);
+
+ /*
+ * Jump to U-Boot image
+ */
+ uboot = (void *) CONFIG_SYS_TEXT_BASE;
+ (*uboot)();
+}