一，概述
1. 目的
將調試信息打印串口由uart0改為uart3。
2. 版本信息
Uboot版本：2014.07；
Kernel版本：Linux-3.10；
二，Uboot
1. sys_config.fex改動
使能uart3(TX:PH00 RX:PH01)，并讓boot0，uboot的debug串口由uart0改為uart3(TX:PH00 RX:PH01)
diff --git a/pack/chips/sun8iw11p1/configs/a40i-p3/sys_config.fex b/pack/chips/sun8iw11p1/configs/a40i-p3/sys_config.fex index 159d3fa..afe98fe 100755
--- a/pack/chips/sun8iw11p1/configs/a40i-p3/sys_config.fex
+++ b/pack/chips/sun8iw11p1/configs/a40i-p3/sys_config.fex@@ -111,9 +111,9 @@ twi_scl = port:PB0<2><default><default><default>twi_sda = port:PB1<2><default><default><default>[uart_para]-uart_debug_port = 0-uart_debug_tx = port:PB22<2><1><default><default>-uart_debug_rx = port:PB23<2><1><default><default>+uart_debug_port = 3+uart_debug_tx = port:PH00<4><1><default><default>+uart_debug_rx = port:PH01<4><1><default><default>[jtag_para]jtag_enable = 1@@ -387,7 +387,7 @@ uart2_rx = port:PI19<7><1><default><default>[uart3]-uart3_used = 0+uart3_used = 1uart3_port = 3uart3_type = 2uart3_tx = port:PH00<4><1><default><default>
2. 宏定義改動
在brandy/u-boot-2014.07/include/configs/sunXXX.h路徑中，修改如下：
diff --git a/u-boot-2014.07/include/configs/sun8iw11p1.h b/u-boot
2014.07/include/configs/sun8iw11p1.h
index b733162..22390a9 100755
--- a/u-boot-2014.07/include/configs/sun8iw11p1.h
+++ b/u-boot-2014.07/include/configs/sun8iw11p1.h
@@ -282,7 +282,7 @@
#define CONFIG_SYS_NS16550_COM4 SUNXI_UART3_BASE
#define CONFIG_NS16550_FIFO_ENABLE (1)
-#define CONFIG_CONS_INDEX 1 /*
which serial channel for console */
+#define CONFIG_CONS_INDEX 4 /*
which serial channel for console */
#define CONFIG_SETUP_MEMORY_TAGS
CONFIG_CONS_INDEX=4,對應serial3 ;如下表：
| 串口通道 | CONFIG_CONS_INDEX |
|---|---|
| serial0 | 1 |
| serial1 | 2 |
| serial2 | 3 |
| serial3 | 4 |
| serial4 | 5 |
| serial5 | 6 |
指定波特率：
#define CONFIG_BAUDRATE 115200
3. 初始化改動
boot0已經限制了僅使用uart0，將這一修改去掉，將會按照sys_config.fex中的uart_debug_port配置的uart端口輸出信息。
diff --git a/u-boot-2014.07/arch/arm/cpu/armv7/sun8iw11p1/spl/serial_spl.c
b/u-boot-2014.07/arch/arm/cpu/armv7/sun8iw11p1/spl/serial_spl.cindex 3f6c141..70955df 100644--- a/u-boot-2014.07/arch/arm/cpu/armv7/sun8iw11p1/spl/serial_spl.c+++ b/u-boot-2014.07/arch/arm/cpu/armv7/sun8iw11p1/spl/serial_spl.c@@ -44,10 +44,10 @@ void sunxi_serial_init(int uart_port, void *gpio_cfg,
int gpio_max)u32 reg, i;u32 uart_clk;
- if( (uart_port < 0) ||(uart_port > 0) )
- {
- return;- }+ // if( (uart_port < 0) ||(uart_port > 0) )+ // {+ // return;+ // }//resetreg = readl(CCMU_BUS_SOFT_RST_REG4);reg &= ~(1<<(CCM_UART_PORT_OFFSET + uart_port));
4. 打包改動
由于平臺適配性問題，在更改了uart_para參數后，會出現采用PhoenixSuit無法燒錄固件的情況。由于在pack階段，會解析sys_confg.fex的uart_para配置項，然后更新boot0，fes1，uboot的頭部信息，路徑（tools/pack/pack）
update_fes1 fes1.fex sys_config.bin > /dev/null
出現無法燒錄的原因是pack更新了fes1的頭部信息，導致校驗不通過，所以需要屏蔽fes1的更新，修改如下：
diff --git a/pack_tools/update_fes1/update_fes1.c
b/pack_tools/update_fes1/update_fes1.c
index 6134c96..536dfb1 100755--- a/pack_tools/update_fes1/update_fes1.c+++ b/pack_tools/update_fes1/update_fes1.c@@ -230,6 +230,21 @@ int update_for_fes1(char *fes1_name, int storage_type)}}+ fes1_head->prvt_head.uart_port = 0;+ fes1_head->prvt_head.uart_ctrl[0].port = 2;+ fes1_head->prvt_head.uart_ctrl[0].port_num = 22;+ fes1_head->prvt_head.uart_ctrl[0].mul_sel = 2;+ fes1_head->prvt_head.uart_ctrl[0].pull = 1;+ fes1_head->prvt_head.uart_ctrl[0].drv_level = -1;+ fes1_head->prvt_head.uart_ctrl[0].data = -1;++ fes1_head->prvt_head.uart_ctrl[1].port = 2;+ fes1_head->prvt_head.uart_ctrl[1].port_num = 23;+ fes1_head->prvt_head.uart_ctrl[1].mul_sel = 2;+ fes1_head->prvt_head.uart_ctrl[1].pull = 1;+ fes1_head->prvt_head.uart_ctrl[1].drv_level = -1;+ fes1_head->prvt_head.uart_ctrl[1].data = -1;+//取出數據進行修正,debugenable參數if(!script_parser_fetch("jtag_para", "jtag_enable", value)){
更新update_fes1工具：進入brandy/pack_tools/update_fes1/ 目錄，執行make命令，用生成的 update_fes1覆蓋tools/pack/pctools/linux/mod_update/update_fes1 ，再進行 pack 操作即可。
但這樣會造成fes1的輸出依然還是uart0,所以我們需要更改fes1的代碼，如下：
diff --git a/lichee/brandy/u-boot-2014.07/sunxi_spl/fes_init/main/fes1_main.c b/lichee/brandy/u-boot-2014.07/sunxi_spl/fes_init/main/fes1_main.c
index 31a01017c5..1b794e2010 100755
--- a/lichee/brandy/u-boot-2014.07/sunxi_spl/fes_init/main/fes1_main.c
+++ b/lichee/brandy/u-boot-2014.07/sunxi_spl/fes_init/main/fes1_main.c
@@ -101,9 +101,35 @@ int main(void){__s32 dram_size=0;- timer_init();
+ timer_init();
+if(CONFIG_CONS_INDEX == 4)
+{
+ boot0_file_head_t fes1_head_fix;
+ fes1_head_fix.prvt_head.uart_port = 3;
+ fes1_head_fix.prvt_head.uart_ctrl[0].port = 8;
+ fes1_head_fix.prvt_head.uart_ctrl[0].port_num = 0;
+ fes1_head_fix.prvt_head.uart_ctrl[0].mul_sel = 4;
+ fes1_head_fix.prvt_head.uart_ctrl[0].pull = 1;
+ fes1_head_fix.prvt_head.uart_ctrl[0].drv_level = -1;
+ fes1_head_fix.prvt_head.uart_ctrl[0].data = -1;
+
+
+ fes1_head_fix.prvt_head.uart_ctrl[1].port = 8;
+ fes1_head_fix.prvt_head.uart_ctrl[1].port_num = 0;
+ fes1_head_fix.prvt_head.uart_ctrl[1].mul_sel = 4;
+ fes1_head_fix.prvt_head.uart_ctrl[1].pull = 1;
+ fes1_head_fix.prvt_head.uart_ctrl[1].drv_level = -1;
+ fes1_head_fix.prvt_head.uart_ctrl[1].data = -1;
+
+ //serial init
+ sunxi_serial_init(fes1_head_fix.prvt_head.uart_port, (void *)fes1_head_fix.prvt_head.uart_ctrl, 2);
+ }
+ else
+ {//serial init
- sunxi_serial_init(fes1_head.prvt_head.uart_port, (void *)fes1_head.prvt_head.uart_ctrl, 2);
+ sunxi_serial_init(fes1_head_fix.prvt_head.uart_port, (void *)fes1_head_fix.prvt_head.uart_ctrl, 2);
+ }
+#ifdef CONFIG_SUNXI_MULITCORE_BOOTpmu_init();set_pll_voltage(1260);
其中，CONFIG_CONS_INDEX即為brandy/u-boot-2014.07/include/configs/sunXXX.h路徑中的宏。
5. 啟動參數改動
更改uboot傳遞給kernel的啟動參數，路徑pack/chips/sun8iw11p1/configs/default/env.cfg可能
因為配置有所不同
diff --git a/pack/chips/sun8iw11p1/configs/default/env.cfg
b/pack/chips/sun8iw11p1/configs/default/env.cfgindex eb60f41..922057e 100755
--- a/pack/chips/sun8iw11p1/configs/default/env.cfg
+++ b/pack/chips/sun8iw11p1/configs/default/env.cfg@@ -1,9 +1,9 @@#kernel command argumentsenforcing=1-earlyprintk=sunxi-uart,0x01c28000+earlyprintk=sunxi-uart,0x01c28c00initcall_debug=0-console=ttyS0,115200+console=ttyS3,115200nand_root=/dev/systemmmc_root=/dev/mmcblk0p7nor_root=/dev/mtdblock2
重新編譯boot0,uboot。
三. Kernel
1. config改動
修改 kernel 的 menuconfig 中 uart 的打印端口和基地址:
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debugindex 4d17934..3aea83e 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -443,6 +443,13 @@ choiceSay Y here if you want kernel low-level debugging supporton Allwinner A1X based platforms on the UART1.+ config DEBUG_SUNXI_UART3+ bool "Kernel low-level debugging messages via sunXi UART3"+ depends on ARCH_SUNXI+ help+ Say Y here if you want kernel low-level debugging support+ on Allwinner A1X based platforms on the UART3.+config DEBUG_TEGRA_UARTdepends on ARCH_TEGRAbool "Use Tegra UART for low-level debug"@@ -662,7 +669,7 @@ config DEBUG_LL_INCLUDEDEBUG_MMP_UART3default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 ||
DEBUG_SIRFMARCO_UART1default "debug/socfpga.S" if DEBUG_SOCFPGA_UART- default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1+ default "debug/sunxi.S" if DEBUG_SUNXI_UART0 || DEBUG_SUNXI_UART1 || DEBUG_SUNXI_UART3default "debug/tegra.S" if DEBUG_TEGRA_UARTdefault "debug/ux500.S" if DEBUG_UX500_UARTdefault "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
diff --git a/arch/arm/include/debug/sunxi.S b/arch/arm/include/debug/sunxi.Sindex 04eb56d..5f66699 100644--- a/arch/arm/include/debug/sunxi.S+++ b/arch/arm/include/debug/sunxi.S@@ -16,6 +16,9 @@#elif defined(CONFIG_DEBUG_SUNXI_UART1)#define SUNXI_UART_DEBUG_PHYS_BASE 0x01c28400#define SUNXI_UART_DEBUG_VIRT_BASE 0xf1c28400+#elif defined(CONFIG_DEBUG_SUNXI_UART3)+#define SUNXI_UART_DEBUG_PHYS_BASE 0x01c28c00+#define SUNXI_UART_DEBUG_VIRT_BASE 0xf1c28c00#endif.macro addruart, rp, rv, tmp
增加DEBUG_SUNXI_UART3后，在menuconfig中選擇：
make ARCH=arm menuconfig
2. 設備樹改動
dts可改可不改，為了統一，這里的設備樹也一起更改，實際上這里的配置會被uboot傳遞的啟動參數覆蓋
diff --git a/arch/arm/boot/dts/sun8iw11p1.dtsi
b/arch/arm/boot/dts/sun8iw11p1.dtsiindex 526fe29..4e00a86 100755--- a/arch/arm/boot/dts/sun8iw11p1.dtsi+++ b/arch/arm/boot/dts/sun8iw11p1.dtsi@@ -61,7 +61,7 @@};chosen {- bootargs = "earlyprintk=sunxi-uart,0x01c28000 loglevel=8
initcall_debug=1 console=ttyS0 init=/init";+ bootargs = "earlyprintk=sunxi-uart,0x01c28c00 loglevel=8
initcall_debug=1 console=ttyS3 init=/init";linux,initrd-start = <0x0 0x0>;linux,initrd-end = <0x0 0x0>;};
四，文件系統
1. defconfig改動
修改buildroot-201611/configs/sun8iw11p1_defconfig 下的配置：
diff --git a/configs/sun8iw11p1_defconfig b/configs/sun8iw11p1_defconfigindex e4b6313..89c9e01 100755--- a/configs/sun8iw11p1_defconfig+++ b/configs/sun8iw11p1_defconfig@@ -273,7 +273,7 @@ BR2_SYSTEM_BIN_SH_BASH=y# BR2_SYSTEM_BIN_SH_NONE is not setBR2_SYSTEM_BIN_SH="bash"BR2_TARGET_GENERIC_GETTY=y-BR2_TARGET_GENERIC_GETTY_PORT="ttyS0"+BR2_TARGET_GENERIC_GETTY_PORT="ttyS3"# BR2_TARGET_GENERIC_GETTY_BAUDRATE_KEEP is not set# BR2_TARGET_GENERIC_GETTY_BAUDRATE_9600 is not set# BR2_TARGET_GENERIC_GETTY_BAUDRATE_19200 is not set
注：
執行build.sh編譯builroot的過程：
tools/build/mkcommon.sh 會執行buildroot-201611/scripts/mkcommon.sh ，然后在buildroot-201611/scripts/build.sh 的build_buildroot函數中，
會判斷是否存在out/sun8iw11p1/linux/common/buildroot/.config ，
如果存在，則使用該配置，否則使用buildroot-201611/configs/sun8iw11p1_defconfig ，所以需要
清空out目錄，或者直接刪除out/sun8iw11p1/linux/common/buildroot/.config
如果不確定是否配置成功，可以在buildroot-201611/package/skeleton/skeleton.mk 增加打印:
diff --git a/package/skeleton/skeleton.mk b/package/skeleton/skeleton.mkindex a4788e1..702596b 100644--- a/package/skeleton/skeleton.mk+++ b/package/skeleton/skeleton.mk@@ -223,6 +223,7 @@ endefelse ifeq ($(BR2_INIT_BUSYBOX),y)# Add getty to busybox inittabdefine SKELETON_SET_GETTY+ echo "SKELETON_TARGET_GENERIC_GETTY_PORT$(SKELETON_TARGET_GENERIC_GETTY_PORT)"$(SED) '/#
GENERIC_SERIAL$$/s~^.*#~$(SKELETON_TARGET_GENERIC_GETTY_PORT)::respawn:/sbin/getty -L $(SKELETON_TARGET_GENERIC_GETTY_OPTIONS)
$(SKELETON_TARGET_GENERIC_GETTY_PORT) $(SKELETON_TARGET_GENE$(TARGET_DIR)/etc/inittabendef
五，整體重新編譯打包
./build.sh && ./build.sh pack
(A-E))
