Android 9.0 MTK8765uart串口不打印log信息

Android 9.0 MTK8765 uart串口不打印log信息

mtk uart串口信息是包含pl lk kernel层log信息
本次项目的包含两组uart口 uart0,uart1客户要使用uart用于通信功能

1 配置好GPIO口信息
1）配置dts文件
查看原理图和GPIO映射表配置GPIO口信息

从原理图和GPIO口映射表中可以看出uart0 Rx口是gpio20引脚，uart0 Tx口是gpio21引脚; uart1 Rx口是gpio22引脚， Tx口是gpio23引脚

/* UART GPIO */
&apuart0 {
	pinctrl-names = "uart0_gpio_default",
			"uart0_rx_set",
			"uart0_rx_clear",
			"uart0_tx_set",
			"uart0_tx_clear";
	pinctrl-0 = <&uart0_gpio_def_cfg>;
	pinctrl-1 = <&uart0_rx_set_cfg>;
	pinctrl-2 = <&uart0_rx_clr_cfg>;
	pinctrl-3 = <&uart0_tx_set_cfg>;
	pinctrl-4 = <&uart0_tx_clr_cfg>;
	status = "okay";
};

&apuart1 {
	pinctrl-names = "uart1_gpio_default",
			"uart1_rx_set",
			"uart1_rx_clear",
			"uart1_tx_set",
			"uart1_tx_clear";
	pinctrl-0 = <&uart1_gpio_def_cfg>;
	pinctrl-1 = <&uart1_rx_set_cfg>;
	pinctrl-2 = <&uart1_rx_clr_cfg>;
	pinctrl-3 = <&uart1_tx_set_cfg>;
	pinctrl-4 = <&uart1_tx_clr_cfg>;
	status = "okay";
};

&pio {
	/* UART GPIO Settings - Start */
	/* UART0: rx set, rx clear, tx clear, tx clear*/
	uart0_gpio_def_cfg:uart0gpiodefault {

	};
	uart0_rx_set_cfg:uart0_rx_set@gpio20 {
		pins_cmd_dat {
			pins = ;
		};
	};
	uart0_rx_clr_cfg:uart0_rx_clear@gpio20 {
		pins_cmd_dat {
			pins = ;
			slew-rate = <1>;
			output-high;
		};
	};
	uart0_tx_set_cfg:uart0_tx_set@gpio21 {
		pins_cmd_dat {
			pins = ;
		};
	};
	uart0_tx_clr_cfg:uart0_tx_clear@gpio21 {
		pins_cmd_dat {
			pins = ;
			slew-rate = <1>;
			output-high;
		};
	};

	
	/* UART1: rx set, rx clear, tx clear, tx clear*/
	uart1_gpio_def_cfg:uart1gpiodefault {

	};
	uart1_rx_set_cfg:uart1_rx_set@gpio22 {
		pins_cmd_dat {
			pins = ;
		};
	};
	uart1_rx_clr_cfg:uart1_rx_clear@gpio22 {
		pins_cmd_dat {
			pins = ;
			slew-rate = <1>;
			output-high;
		};
	};
	uart1_tx_set_cfg:uart1_tx_set@gpio23 {
		pins_cmd_dat {
			pins = ;
		};
	};
	uart1_tx_clr_cfg:uart1_tx_clear@gpio23 {
		pins_cmd_dat {
			pins = ;
			slew-rate = <1>;
			output-high;
		};
	};
};/* UART GPIO end */

2)配置dws文件

2 pl层配置
首先明白log口的定义，CFG_UART_LOG和CFG_UART_META，在mediatek/custom/project name/preloader/cust bldr.mak中定义。使用CFG UART LOG定义AP日志端口;CFG_UART_META用于定义MD/META日志端口。

\vendor\mediatek\proprietary\bootable\bootloader\preloader\custom\tb8765ap1_bsp\cust_bldr.mak 改定义口
CFG_UART_LOG :=UART4
CFG_UART_META :=UART2

\vendor\mediatek\proprietary\bootable\bootloader\preloader\platform\mt6739\mode\DUMMY_AP.mak改定义口
CFG_UART_LOG :=UART3
CFG_UART_META :=UART3

\vendor\mediatek\proprietary\bootable\bootloader\preloader\platform\mt6739\default.mak 改定义口
CFG_UART_LOG :=UART4
CFG_UART_META :=UART2

**\vendor\mediatek\proprietary\bootable\bootloader\preloader\platform\mt6739\src\drivers\uart.c 打印实现体不执行直接return返回

void PutUARTByte (const char c)
{
  // /*disable UART log in preloader, do nothing here*/
	return;
    
    while (!(UART_READ32 (UART_LSR(g_uart)) & UART_LSR_THRE))
    {
    }

    if (c == '\n')
        UART_WRITE32 ((unsigned int) '\r', UART_THR(g_uart));

    UART_WRITE32 ((unsigned int) c, UART_THR(g_uart));

}

**

2）lk层

**\vendor\mediatek\proprietary\bootable\bootloader\lk\app\mt_boot\mt_boot.c 传进kernel参数printk.disable_uart=1表示不打印log
printk.disable_uart=1
`

int boot_linux_fdt(void *kernel, unsigned *tags,
		   unsigned machtype,
		   void *ramdisk, unsigned ramdisk_sz)
{	
..........
if (!has_set_p2u) {
	switch (eBuildType) {
	case BUILD_TYPE_USER://用户版本
		if (((g_boot_mode == META_BOOT) && is_meta_log_disable &&
#ifdef LOG_STORE_SUPPORT
			    (is_meta_log_disable() == 0)) || g_boot_arg->log_dynamic_switch)
#else
		      (is_meta_log_disable() == 0)))
#endif
				cmdline_append("printk.disable_uart=1");
			else
				cmdline_append("printk.disable_uart=1");
			break;
		case BUILD_TYPE_USERDEBUG://用户调试版本
			if ((g_boot_mode == META_BOOT) && is_meta_log_disable &&
#ifdef LOG_STORE_SUPPORT
			    (is_meta_log_disable() == 1) && (g_boot_arg->log_dynamic_switch == 0))
#else
			    (is_meta_log_disable() == 1))
#endif
				cmdline_append("printk.disable_uart=1 slub_debug=O");
#ifdef LOG_STORE_SUPPORT
			else if (boot_ftrace && g_boot_arg->log_dynamic_switch == 0)
#else
			else if (boot_ftrace)
#endif
				cmdline_append("printk.disable_uart=1 slub_debug=-");
			else
				cmdline_append("printk.disable_uart=1");
			break;

		case BUILD_TYPE_ENG://工程师版本
			if ((g_boot_mode == META_BOOT) && is_meta_log_disable &&
			    (is_meta_log_disable() == 1))
				cmdline_append("printk.disable_uart=1 slub_debug=O");
			else
				cmdline_append("printk.disable_uart=1 ddebug_query=\"file *mediatek* +p ; file *gpu* =_\"");
		break;

	default:
		assert(0);
		break;
	}
	.......
	}

`**

修改路径有两个\vendor\mediatek\proprietary\bootable\bootloader\lk\platform\common\uart\uart.c
\vendor\mediatek\proprietary\bootable\bootloader\lk\platform\mt6739\uart.c
屏蔽uart开关宏

//#define __ENABLE_UART_LOG_SWITCH_FEATURE__

修改路径有两个\vendor\mediatek\proprietary\bootable\bootloader\lk\platform\common\uart\uart.c
\vendor\mediatek\proprietary\bootable\bootloader\lk\platform\mt6739\uart.c
打印实现体不执行直接return返回**

int uart_putc(const char c )
{
	/*disable UART log in lk, do nothing here*/
	return 0;
	if (g_boot_arg->log_enable == 0)
		return 0;

#ifdef USER_LOAD
	if (g_boot_arg->log_dynamic_switch == 0)
		return 0;
	if (g_lk_final_log == 0)
		return 0;
#endif

	while (!(DRV_Reg32(UART_LSR(g_uart)) & UART_LSR_THRE));

	if (c == '\n')
		mt65xx_reg_sync_writel((unsigned int)'\r', UART_THR(g_uart));

	mt65xx_reg_sync_writel((unsigned int)c, UART_THR(g_uart));

	return 0;
}

int uart_getc(void)  /* returns -1 if no data available */
{
	return 0;
	if (g_boot_arg->log_enable == 0)
		return 0;

#ifdef USER_LOAD
	if (g_boot_arg->log_dynamic_switch == 0)
		return 0;
	if (g_lk_final_log == 0)
		return 0;
#endif

	while (!(DRV_Reg32(UART_LSR(g_uart)) & UART_LSR_DR));
	return (int)DRV_Reg32(UART_RBR(g_uart));
}

void uart_puts(const char *s)
{
return;
	 while (*s)
		uart_putc(*s++);
}

3 9.0 trusty层也是有一些log信息，需要屏蔽

\trusty\vendor\mediatek\proprietary\platform\mt6739\rules.mk****把log打印口换成串口3 uart0和uart1就不会有打印串口信息
CFG_LOG_REG_BASE ?= UART3_BASE

4 kernel层
把动态打印，时间打印，打印信息相关宏改关闭，我这里是直接屏蔽掉
**这里有两处修改的地方
\device\mediateksample\tb8765ap1_bsp\elink\PCBA\S108\tb8765ap1_bsp_debug_defconfig
\device\mediateksample\tb8765ap1_bsp\elink\PCBA\S108\tb8765ap1_bsp_defconfig

#CONFIG_PRINTK_TIME=y
#CONFIG_DYNAMIC_DEBUG=y
#CONFIG_DEBUG_INFO=y

**

\kernel-4.4\include\linux\printk.h 把打印等级给调到最低值 0

/* We show everything that is MORE important than this.. */
#define CONSOLE_LOGLEVEL_SILENT  0 /* Mum's the word */
#define CONSOLE_LOGLEVEL_MIN	 0 /* Minimum loglevel we let people use */
#define CONSOLE_LOGLEVEL_QUIET	 0 /* Shhh ..., when booted with "quiet" */
#define CONSOLE_LOGLEVEL_DEFAULT 0 /* anything MORE serious than KERN_DEBUG */
#define CONSOLE_LOGLEVEL_DEBUG	0 /* issue debug messages */
#define CONSOLE_LOGLEVEL_MOTORMOUTH 0	/* You can't shut this one up */

5 控制台相关使能log口关闭
**\device\mediatek\mt6739\init.mt6739.rc
**
不使能prink

## mtk printk uart controller
on property:persist.vendor.uartconsole.enable=0
    write /proc/mtprintk ${persist.vendor.uartconsole.enable}
....
on property:persist.vendor.mediatek.fg.log.enable=0
    write /sys/devices/platform/battery_meter/FG_daemon_log_level 7
    write /sys/bus/platform/devices/battery/FG_daemon_log_level 7
    write /proc/sys/kernel/printk 8

\device\mediatek\mt6739\init.mt6739.usb.rc
不使能prink

on property:vendor.usb.printk=0
	write /proc/sys/kernel/printk ${vendor.usb.printk}

on property:persist.vendor.usb.printk=0
	setprop vendor.usb.printk ${persist.vendor.usb.printk}

\system\core\rootdir\init.rc
关闭debuggable

on property:ro.debuggable=0
    # Give writes to anyone for the trace folder on debug builds.
    # The folder is used to store method traces.
    chmod 0773 /data/misc/trace
    # Give reads to anyone for the window trace folder on debug builds.
    chmod 0775 /data/misc/wmtrace
    start console