--- zzzz-none-000/linux-3.10.107/arch/mips/ath79/early_printk.c	2017-06-27 09:49:32.000000000 +0000
+++ vr9-7490-729/linux-3.10.107/arch/mips/ath79/early_printk.c	2021-11-10 11:53:53.000000000 +0000
@@ -12,11 +12,13 @@
 #include <linux/io.h>
 #include <linux/errno.h>
 #include <linux/serial_reg.h>
+#include <linux/clk.h>
 #include <asm/addrspace.h>
 
 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/ar71xx_regs.h>
 #include <asm/mach-ath79/ar933x_uart.h>
+#include <asm/mach-ath79/atheros.h>
 
 static void (*_prom_putchar) (unsigned char);
 
@@ -31,17 +33,20 @@
 	} while (1);
 }
 
+#if (defined CONFIG_SOC_AR71XX || defined CONFIG_SOC_AR724X || defined CONFIG_SOC_AR913X || defined CONFIG_SOC_AR934X || defined CONFIG_SOC_QCA955X)
 #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
 
 static void prom_putchar_ar71xx(unsigned char ch)
 {
-	void __iomem *base = (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE));
+	void __iomem *base = (void __iomem *)(KSEG1ADDR(ATH_UART_BASE));
 
 	prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY);
 	__raw_writel(ch, base + UART_TX * 4);
 	prom_putchar_wait(base + UART_LSR * 4, BOTH_EMPTY, BOTH_EMPTY);
 }
+#endif
 
+#if defined CONFIG_SOC_AR933X
 static void prom_putchar_ar933x(unsigned char ch)
 {
 	void __iomem *base = (void __iomem *)(KSEG1ADDR(AR933X_UART_BASE));
@@ -52,6 +57,7 @@
 	prom_putchar_wait(base + AR933X_UART_DATA_REG, AR933X_UART_DATA_TX_CSR,
 			  AR933X_UART_DATA_TX_CSR);
 }
+#endif
 
 static void prom_putchar_dummy(unsigned char ch)
 {
@@ -63,11 +69,12 @@
 	void __iomem *base;
 	u32 id;
 
-	base = (void __iomem *)(KSEG1ADDR(AR71XX_RESET_BASE));
-	id = __raw_readl(base + AR71XX_RESET_REG_REV_ID);
-	id &= REV_ID_MAJOR_MASK;
+	base = (void __iomem *)(KSEG1ADDR(ATH_RESET_BASE));
+	id = __raw_readl(base + ATH_RESET_REG_REV_ID);
+	id &= ATH_RESET_REVISION_ID_MAJOR_MASK;
 
 	switch (id) {
+#if (defined CONFIG_SOC_AR71XX || defined CONFIG_SOC_AR724X || defined CONFIG_SOC_AR913X || defined CONFIG_SOC_AR934X || defined CONFIG_SOC_QCA955X)
 	case REV_ID_MAJOR_AR71XX:
 	case REV_ID_MAJOR_AR7240:
 	case REV_ID_MAJOR_AR7241:
@@ -80,11 +87,14 @@
 	case REV_ID_MAJOR_QCA9558:
 		_prom_putchar = prom_putchar_ar71xx;
 		break;
+#endif
 
+#if defined CONFIG_SOC_AR933X
 	case REV_ID_MAJOR_AR9330:
 	case REV_ID_MAJOR_AR9331:
 		_prom_putchar = prom_putchar_ar933x;
 		break;
+#endif        
 
 	default:
 		_prom_putchar = prom_putchar_dummy;
@@ -92,10 +102,43 @@
 	}
 }
 
-void prom_putchar(unsigned char ch)
-{
+void prom_putchar(unsigned char ch) {
+
 	if (!_prom_putchar)
 		prom_putchar_init();
 
 	_prom_putchar(ch);
 }
+
+/*------------------------------------------------------------------------------------------*\
+\*------------------------------------------------------------------------------------------*/
+/*------------------------------------------------------------------------------------------*\
+\*------------------------------------------------------------------------------------------*/
+extern int vsprintf(char *buf, const char *fmt, va_list args);
+static char sprint_buf[1024];
+
+void writeserial(char *str, int count) {
+
+	int i;
+	for (i = 0; i < count; i++)
+		prom_putchar(str[i]);
+
+	prom_putchar('\r');
+	memset(str, '\0', 1024);
+	return;
+}
+
+/*------------------------------------------------------------------------------------------*\
+\*------------------------------------------------------------------------------------------*/
+void serial_print(const char *fmt, ...)
+{
+	va_list args;
+	int n;
+
+	va_start(args, fmt);
+	n = vsprintf(sprint_buf, fmt, args);
+	va_end(args);
+	writeserial(sprint_buf, n);
+}
+
+