1 files changed, 61 insertions, 0 deletions
diff --git a/target/linux/ar71xx/patches-4.4/521-MIPS-ath79-enable-UART-for-early_serial.patch b/target/linux/ar71xx/patches-4.4/521-MIPS-ath79-enable-UART-for-early_serial.patch
new file mode 100644
index 0000000..3d6ddfe
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.4/521-MIPS-ath79-enable-UART-for-early_serial.patch
@@ -0,0 +1,61 @@
+--- a/arch/mips/ath79/early_printk.c
++++ b/arch/mips/ath79/early_printk.c
+@@ -56,6 +56,46 @@ static void prom_putchar_dummy(unsigned
+ 	/* nothing to do */
+ }
+ 
++static void prom_enable_uart(u32 id)
++{
++	void __iomem *gpio_base;
++	u32 uart_en;
++	u32 t;
++
++	switch (id) {
++	case REV_ID_MAJOR_AR71XX:
++		uart_en = AR71XX_GPIO_FUNC_UART_EN;
++		break;
++
++	case REV_ID_MAJOR_AR7240:
++	case REV_ID_MAJOR_AR7241:
++	case REV_ID_MAJOR_AR7242:
++		uart_en = AR724X_GPIO_FUNC_UART_EN;
++		break;
++
++	case REV_ID_MAJOR_AR913X:
++		uart_en = AR913X_GPIO_FUNC_UART_EN;
++		break;
++
++	case REV_ID_MAJOR_AR9330:
++	case REV_ID_MAJOR_AR9331:
++		uart_en = AR933X_GPIO_FUNC_UART_EN;
++		break;
++
++	case REV_ID_MAJOR_AR9341:
++	case REV_ID_MAJOR_AR9342:
++	case REV_ID_MAJOR_AR9344:
++		/* TODO */
++	default:
++		return;
++	}
++
++	gpio_base = (void __iomem *)(KSEG1ADDR(AR71XX_GPIO_BASE));
++	t = __raw_readl(gpio_base + AR71XX_GPIO_REG_FUNC);
++	t |= uart_en;
++	__raw_writel(t, gpio_base + AR71XX_GPIO_REG_FUNC);
++}
++
+ static void prom_putchar_init(void)
+ {
+ 	void __iomem *base;
+@@ -86,8 +126,10 @@ static void prom_putchar_init(void)
+ 
+ 	default:
+ 		_prom_putchar = prom_putchar_dummy;
+-		break;
++		return;
+ 	}
++
++	prom_enable_uart(id);
+ }
+ 
+ void prom_putchar(unsigned char ch)