一，概述
1. 目的
将调试信息打印串口由uart0改为uart3。
2. 版本信息
Uboot版本：2014.07；
Kernel版本：Linux-3.10；
二，Uboot
1. sys_config.fex改动
使能uart3(TX:PH00 RX:PH01)，并让boot0，uboot的debug串口由uart0改为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 = 1
uart3_port = 3
uart3_type = 2
uart3_tx = port:PH00<4><1><default><default>
2. 宏定义改动
在brandy/u-boot-2014.07/include/configs/sunXXX.h路径中，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,对应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. 初始化改动
boot0已经限制了仅使用uart0，将这一修改去掉，将会按照sys_config.fex中的uart_debug_port配置的uart端口输出信息。
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.c
index 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;
+ // }
//reset
reg = readl(CCMU_BUS_SOFT_RST_REG4);
reg &= ~(1<<(CCM_UART_PORT_OFFSET + uart_port));
4. 打包改动
由于平台适配性问题，在更改了uart_para参数后，会出现采用PhoenixSuit无法烧录固件的情况。由于在pack阶段，会解析sys_confg.fex的uart_para配置项，然后更新boot0，fes1，uboot的头部信息，路径（tools/pack/pack）
update_fes1 fes1.fex sys_config.bin > /dev/null
出现无法烧录的原因是pack更新了fes1的头部信息，导致校验不通过，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;
+
//取出数据进行修正,debugenable参数
if(!script_parser_fetch("jtag_para", "jtag_enable", value))
{
更新update_fes1工具：进入brandy/pack_tools/update_fes1/ 目录，执行make命令，用生成的 update_fes1覆盖tools/pack/pctools/linux/mod_update/update_fes1 ，再进行 pack 操作即可。
但这样会造成fes1的输出依然还是uart0,所以我们需要更改fes1的代码，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_BOOT
pmu_init();
set_pll_voltage(1260);
其中，CONFIG_CONS_INDEX即为brandy/u-boot-2014.07/include/configs/sunXXX.h路径中的宏。
5. 启动参数改动
更改uboot传递给kernel的启动参数，路径pack/chips/sun8iw11p1/configs/default/env.cfg可能
因为配置有所不同
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 arguments
enforcing=1
-earlyprintk=sunxi-uart,0x01c28000
+earlyprintk=sunxi-uart,0x01c28c00
initcall_debug=0
-console=ttyS0,115200
+console=ttyS3,115200
nand_root=/dev/system
mmc_root=/dev/mmcblk0p7
nor_root=/dev/mtdblock2
重新编译boot0,uboot。
三. Kernel
1. config改动
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.debug
index 4d17934..3aea83e 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -443,6 +443,13 @@ choice
Say Y here if you want kernel low-level debugging support
on 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_UART
depends on ARCH_TEGRA
bool "Use Tegra UART for low-level debug"
@@ -662,7 +669,7 @@ config DEBUG_LL_INCLUDE
DEBUG_MMP_UART3
default "debug/sirf.S" if DEBUG_SIRFPRIMA2_UART1 ||
DEBUG_SIRFMARCO_UART1
default "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_UART3
default "debug/tegra.S" if DEBUG_TEGRA_UART
default "debug/ux500.S" if DEBUG_UX500_UART
default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
diff --git a/arch/arm/include/debug/sunxi.S b/arch/arm/include/debug/sunxi.S
index 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中选择：
make ARCH=arm menuconfig
2. 设备树改动
dts可改可不改，为了统一，这里的设备树也一起更改，实际上这里的配置会被uboot传递的启动参数覆盖
diff --git a/arch/arm/boot/dts/sun8iw11p1.dtsi
b/arch/arm/boot/dts/sun8iw11p1.dtsi
index 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，文件系统
1. defconfig改动
修改buildroot-201611/configs/sun8iw11p1_defconfig 下的配置：
diff --git a/configs/sun8iw11p1_defconfig b/configs/sun8iw11p1_defconfig
index 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 set
BR2_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：
执行build.sh编译builroot的过程：
tools/build/mkcommon.sh 会执行buildroot-201611/scripts/mkcommon.sh ，然后在buildroot-201611/scripts/build.sh 的build_buildroot函数中，
会判断是否存在out/sun8iw11p1/linux/common/buildroot/.config ，
如果存在，则使用该配置，否则使用buildroot-201611/configs/sun8iw11p1_defconfig ，所以需要
清空out目录，或者直接删除out/sun8iw11p1/linux/common/buildroot/.config
如果不确定是否配置成功，可以在buildroot-201611/package/skeleton/skeleton.mk 增加打印:
diff --git a/package/skeleton/skeleton.mk b/package/skeleton/skeleton.mk
index a4788e1..702596b 100644
--- a/package/skeleton/skeleton.mk
+++ b/package/skeleton/skeleton.mk
@@ -223,6 +223,7 @@ endef
else ifeq ($(BR2_INIT_BUSYBOX),y)
# Add getty to busybox inittab
define SKELETON_SET_GETTY
+ echo "SKELETON_TARGET_GENERIC_GETTY_PORT$(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/inittab
endef
五，整体重新编译打包
./build.sh && ./build.sh pack
