[PATCH] imx(25,35): save boot location into $barebox_loc env.
Marc Reilly
marc at cpdesign.com.au
Tue Jan 11 21:27:55 EST 2011
Saves the boot source into an environment variable so env scripts
can more easily use boot source information.
Note only tested on imx35. I haven't added support for any other variants
because I'm not familiar with them. (And can't test them anyway).
Signed-off-by: Marc Reilly <marc at cpdesign.com.au>
---
arch/arm/mach-imx/Makefile | 1 +
arch/arm/mach-imx/boot.c | 95 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 96 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-imx/boot.c
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index d000683..3b2deaf 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_IMX_IIM) += iim.o
obj-$(CONFIG_NAND_IMX) += nand.o
obj-y += speed.o
obj-y += devices.o
+obj-y += boot.o
diff --git a/arch/arm/mach-imx/boot.c b/arch/arm/mach-imx/boot.c
new file mode 100644
index 0000000..446a6ab
--- /dev/null
+++ b/arch/arm/mach-imx/boot.c
@@ -0,0 +1,95 @@
+/*
+ * 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 <environment.h>
+#include <init.h>
+
+#include <asm/io.h>
+#include <mach/imx-regs.h>
+
+#if defined(CONFIG_ARCH_IMX25) || defined(CONFIG_ARCH_IMX35)
+/*
+ * Saves the boot source media into the $barebox_loc enviroment variable
+ *
+ * This information is useful for barebox init scripts as we can then easily
+ * use a kernel image stored on the same media that we launch barebox with
+ * (for example).
+ *
+ * imx25 and imx35 can boot into barebox from several media such as
+ * nand, nor, mmc/sd cards, serial roms. "mmc" is used to represent several
+ * sources as its impossible to distinguish between them.
+ *
+ * Some sources such as serial roms can themselves have 3 different boot
+ * possibilities (i2c1, i2c2 etc). It is assumed that any board will
+ * only be using one of these at any one time.
+ *
+ * Note also that I suspect that the boot source pins are only sampled at
+ * power up.
+ */
+static int imx_boot_save_loc(void)
+{
+ const char *bareboxloc = NULL;
+ uint32_t reg;
+ unsigned int ctrl, type;
+
+ /* [CTRL][TYPE] */
+ const char *const locations[4][4] = {
+ { /* CTRL = WEIM */
+ "nor",
+ 0,
+ "onenand",
+ 0
+ }, { /* CTRL == NAND */
+ "nand",
+ "nand",
+ "nand",
+ "nand",
+ }, { /* CTRL == ATA, (imx35 only) */
+ 0,
+ 0, /* might be p-ata */
+ 0,
+ 0,
+ }, { /* CTRL == expansion */
+ "mmc", /* note imx25 could also be: movinand, ce-ata */
+ 0,
+ "i2c",
+ "spi",
+ }
+ };
+
+ reg = readl(IMX_CCM_BASE + CCM_RCSR);
+ ctrl = (reg >> CCM_RCSR_MEM_CTRL_SHIFT) & 0x3;
+ type = (reg >> CCM_RCSR_MEM_TYPE_SHIFT) & 0x3;
+
+ bareboxloc = locations[ctrl][type];
+
+ if (bareboxloc) {
+ setenv("barebox_loc", bareboxloc);
+ export("barebox_loc");
+ }
+
+ return 0;
+}
+
+/*
+ * This can only be called after env_push_context() has been called
+ * so it is a late_initcall.
+ */
+late_initcall(imx_boot_save_loc);
+
+#endif
--
1.7.1
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