RiOTboard: add new board

this board is produced by Embest/Element 14 and is based on i.MX6 Solo
The following features are tested :
- UART2 (console)
- eMMC
- SDCard
- uSDCard
- Ethernet
- USB Host (through 4 ports hub)
- I2C 1/2/3
- 2 LEDs

Boot on eMMC and through USB loader are tested.

For more informations on this board : http://www.riotboard.org/

Signed-off-by: Eric Bénard <eric@eukrea.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 43 insertions, 0 deletions

diff --git a/arch/arm/boards/embest-riotboard/lowlevel.c b/arch/arm/boards/embest-riotboard/lowlevel.c
new file mode 100644
index 0000000000..814658aaf5
--- /dev/null
+++ b/arch/arm/boards/embest-riotboard/lowlevel.c
@@ -0,0 +1,43 @@
+#include <debug_ll.h>
+#include <common.h>
+#include <sizes.h>
+#include <io.h>
+#include <asm/barebox-arm-head.h>
+#include <asm/barebox-arm.h>
+#include <asm/sections.h>
+#include <asm/cache.h>
+#include <asm/mmu.h>
+#include <mach/imx6-mmdc.h>
+#include <mach/imx6.h>
+
+static inline void setup_uart(void)
+{
+	/* Enable UART for lowlevel debugging purposes */
+	writel(0x00000000, 0x021e8080);
+	writel(0x00004027, 0x021e8084);
+	writel(0x00000704, 0x021e8088);
+	writel(0x00000a81, 0x021e8090);
+	writel(0x0000002b, 0x021e809c);
+	writel(0x00013880, 0x021e80b0);
+	writel(0x0000047f, 0x021e80a4);
+	writel(0x0000c34f, 0x021e80a8);
+	writel(0x00000001, 0x021e8080);
+}
+
+extern char __dtb_imx6s_riotboard_start[];
+
+ENTRY_FUNCTION(start_imx6s_riotboard, r0, r1, r2)
+{
+	uint32_t fdt;
+
+	arm_cpu_lowlevel_init();
+
+	if (IS_ENABLED(CONFIG_DEBUG_LL)) {
+		writel(0x4, 0x020e016c);
+		setup_uart();
+		putc_ll('a');
+	}
+
+	fdt = (uint32_t)__dtb_imx6s_riotboard_start - get_runtime_offset();
+	barebox_arm_entry(0x10000000, SZ_1G, fdt);
+}