When there is not device tree file available to U-Boot, we panic.
Implement board_pre_console_putc() so that this panic will be displayed
on the serial console.
Signed-off-by: Simon Glass <s...@chromium.org>
---
arch/arm/cpu/armv7/tegra2/board.c | 58 +++++++++++++++++++++++++++++++++++++
1 files changed, 58 insertions(+), 0 deletions(-)
diff --git a/arch/arm/cpu/armv7/tegra2/board.c
b/arch/arm/cpu/armv7/tegra2/board.c
index 349d50e..4ca1e1f 100644
--- a/arch/arm/cpu/armv7/tegra2/board.c
+++ b/arch/arm/cpu/armv7/tegra2/board.c
@@ -23,9 +23,11 @@
#include <common.h>
#include <asm/io.h>
+#include <ns16550.h>
#include "ap20.h"
#include <asm/arch/clock.h>
#include <asm/arch/funcmux.h>
+#include <asm/arch/gpio.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/tegra2.h>
#include <asm/arch/pmc.h>
@@ -37,6 +39,7 @@ enum {
UARTA = 1 << 0,
UARTB = 1 << 1,
UARTD = 1 << 3,
+ UART_ALL = 0xf,
UART_COUNT = 4,
};
@@ -149,3 +152,58 @@ void enable_caches(void)
dcache_enable();
}
#endif
+
+
+/*
+ * Possible UART locations: we ignore UARTC at 0x70006200 and UARTE at
+ * 0x70006400, since we don't have code to init them
+ */
+static u32 uart_reg_addr[] = {
+ NV_PA_APB_UARTA_BASE,
+ NV_PA_APB_UARTB_BASE,
+ NV_PA_APB_UARTD_BASE,
+ 0
+};
+
+#ifdef CONFIG_PRE_CONSOLE_PUTC
+/*
+ * This is called when we have no console. About the only reason that this
+ * happen is if we don't have a valid fdt. So we don't know what kind of
+ * Tegra board we are. We blindly try to print a message every which way we
+ * know.
+ */
+void board_pre_console_putc(int ch)
+{
+ int uart_ids = UART_ALL; /* turn it all on! */
+ u32 *uart_addr;
+ int clock_freq, multiplier, baudrate, divisor;
+
+ /* Try to enable all possible UARTs */
+ setup_uarts(uart_ids);
+
+ /*
+ * Seaboard has a UART switch on PI3. We might be a Seaboard,
+ * so flip it!
+ */
+#ifdef CONFIG_SPI_UART_SWITCH
+ gpio_direction_output(GPIO_PI3, 0);
+#endif
+
+ /*
+ * Now send the string out all the Tegra UARTs. We don't try all
+ * possible configurations, but this could be added if required.
+ */
+ clock_freq = CONFIG_DEFAULT_NS16550_CLK;
+ multiplier = CONFIG_DEFAULT_NS16550_MULT;
+ baudrate = CONFIG_BAUDRATE;
+ divisor = (clock_freq + (baudrate * (multiplier / 2))) /
+ (multiplier * baudrate);
+
+ for (uart_addr = uart_reg_addr; *uart_addr; uart_addr++) {
+ NS16550_init((NS16550_t)*uart_addr, divisor);
+ NS16550_putc((NS16550_t)*uart_addr, ch);
+ if (ch == '\n')
+ NS16550_putc((NS16550_t)*uart_addr, '\r');
+ }
+}
+#endif
--
1.7.7.3
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