1. 共同修改的地方
(1) kernel\arch\arm\configs\msm8909-1gb-CB03_defconfig
使以下项有效
CONFIG_SERIAL_MSM_HSL=y
CONFIG_SERIAL_MSM_HSL_CONSOLE=y
增加以下项
CONFIG_DEBUG_LL=y
CONFIG_EARLY_PRINTK=y
(2) Root/bootable/bootloader/lk/project/msms8909.mk
确保DEFINES += WITH_DEBUG_UART=1
2. V1.0主板
图1
UART1_TX-------GPIO_4
UART1_RX-------GPIO_5
(3) device\qcom\sepolicy\common\file_contexts----需要make –j4才生效
使以下项有效
/dev/ttyHSL0 u:object_r:console_device:s0
(4) kernel\arch\arm\boot\dts\qcom\msm8909-cb03.dtsi
使以下项不生效
spi0 = &spi_0; /* SPI0 controller device*/
使以下项有效
blsp1_uart1:[email protected] {
compatible= "qcom,msm-lsuart-v14";
reg= <0x78af000 0x200>;
interrupts= <0 107 0>;
status= "disabled";
clocks= <&clock_gcc clk_gcc_blsp1_uart1_apps_clk>,
<&clock_gcc clk_gcc_blsp1_ahb_clk>;
clock-names= "core_clk", "iface_clk";
};
(5) kernel\arch\arm\boot\dts\qcom\msm8909-qrd-cb03.dtsi
使以下项有效
&blsp1_uart1 {
status= "ok";
pinctrl-names= "default";
pinctrl-0= <&uart_console_sleep>;
};
3. V1.1主板
图2
UART2_TX-------GPIO_20
UART2_RX-------GPIO_21
图3
UART_VDD_EN------I2C扩展IC XRA1201的P6引脚。
所做的修改如下
(1) \bootable\bootloader\lk\platform\msm8909\ msm8909-clock.c
msm_clocks_msm8909[]增加：
CLK_LOOKUP("uart2_iface_clk",gcc_blsp1_ahb_clk.c),
CLK_LOOKUP("uart2_core_clk", gcc_blsp1_uart2_apps_clk.c),
(2) bootable\bootloader\lk\target\msm8909\init.c
target_early_init()函数下
uart_dm_init(1, 0, BLSP1_UART0_BASE); 改为 uart_dm_init(2,0, BLSP_UART1_BASE);
(3) \bootable\bootloader\lk\platform\msm8909\gpio.c
target_early_init()--->uart_dm_init(id)--->gpio_config_uart_dm()
/* configure rx gpio */
gpio_tlmm_config(5,2, GPIO_INPUT, GPIO_NO_PULL,
GPIO_8MA,GPIO_DISABLE);
/*configure tx gpio */
gpio_tlmm_config(4,2, GPIO_OUTPUT, GPIO_NO_PULL,
GPIO_8MA,GPIO_DISABLE);
#endif
改为
/* configure rx gpio */
gpio_tlmm_config(21, 3, GPIO_INPUT, GPIO_NO_PULL,
GPIO_8MA,GPIO_DISABLE);
/*configure tx gpio */
gpio_tlmm_config(20, 3, GPIO_OUTPUT, GPIO_NO_PULL,
GPIO_8MA,GPIO_DISABLE);
(4) \kernel\arch\arm\mach-msm\include\mach\msm_iomap-8909.h
#define MSM_DEBUG_UART_PHYS 0x78AF000改为0x78B0000
(5) device\qcom\sepolicy\common\file_contexts
增加：
/dev/ttyHSL1 u:object_r:console_device:s0
如果有/dev/ttyHSL0 u:object_r:console_device:s0也不影响。
(6) kernel\arch\arm\boot\dts\qcom\msm8909-cb03.dtsi
确保下面有效
blsp1_uart2: [email protected] {
compatible= "qcom,msm-lsuart-v14";
reg= <0x78b0000 0x200>;
interrupts= <0 108 0>;
status= "disabled";
clocks= <&clock_gcc clk_gcc_blsp1_uart2_apps_clk>,
<&clock_gcc clk_gcc_blsp1_ahb_clk>;
clock-names= "core_clk", "iface_clk";
};
同时注释掉blsp1_uart1，因为BLSP1是作为SPI。
(7) \kernel\drivers\misc\msmgpio_ctrl.c
msmgpio_ctrl_probe()增加
gpio_direction_output(pdata->uart1_vcc,1);//确保3.3V供电
这里就算是改为gpio_direction_output(pdata->uart1_vcc,0);也可输出调试信息，这里可能是其他地方有电过来。
(8) msm8909-qrd-skue-cb03.dtsi，比较重要
/ {
aliases{
serial1= &blsp1_uart2;// should be no serial1, 0 for console
};
};
这里确保为采用的串口，下面给出相关介绍
\kernel\Documentation\devicetree\bindings\tty\serial\msm_serial.txt
Aliases: An alias may optionally be used to bind theserial device to a tty device (ttyHSLx) with a given line number. Aliasesare of the form serial<n> where <n> is an integer representing the line numberto use. On systems with multiple serial devices present it is recommendedthat an alias be defined for each such device.
(9) msm8909-pinctrl-cb03.dtsi和msm8909-pinctrl.dtsi
pmx-uartconsole {
qcom,pins= <&gp 4>, <&gp 5>;
qcom,num-grp-pins= <2>;
qcom,pin-func= <2>;
label= "uart-console";
uart_console_sleep:uart-console {
drive-strength= <2>;
bias-pull-down;
};
};
把这两个文件下的qcom,pins =<&gp 4>, <&gp 5>;改为qcom,pins = <&gp 20>, <&gp 21>;
(10) \device\qcom\msm8909\ BoardConfig.mk
BOARD_KERNEL_CMDLINE :=console=ttyHSL0,115200,n8 androidboot.console=ttyHSL0 androidboot.hardware=qcomuser_debug=31 msm_rtb.filter=0x3F ehci-hcd.park=3androidboot.bootdevice=7824900.sdhci lpm_levels.sleep_disabled=1 earlyprintk
上面的ttyHSL0统一改为ttyHSL1，同时去掉最后面的earlyprintk，否则启动失败信息如下：
Android Bootloader - UART_DM Initialized!!! [70] Not able to search the panel: [80] Logo config doesn‘t match with fbconfig. Fall back default logo [520] Channel alloc freed Uncompressing Linux... done, booting thekernel.
一开机可能就卡在这里，或是多次自动反复重启后停止这里，输出的都是这些信息。只要加上earlyprintk，就有这问题。
(11) kernel\arch\arm\boot\dts\qcom\msm8909-cb03.dtsi
4. V1.0主板和V1.1主板可显示调试信息的差异
V1.0主板可以输出更早启动阶段的调试信息，应该是由UART1改为UART2后，还有一些地方没有改好，如下：
Format: Log Type - Time(microsec) - Message- Optional Info Log Type: B - Since Boot(Power OnReset), D - Delta, S - Statistic S -QC_IMAGE_VERSION_STRING=BOOT.BF.3.1.2.C2-00014 S - IMAGE_VARIANT_STRING=DAASANAZA S - OEM_IMAGE_VERSION_STRING=BU3-gongyong5 S - Boot Config, 0x000000e1 B - 1566 - PBL, Start B - 4542 - bootable_media_detect_entry, Start B - 74039 - bootable_media_detect_success, Start B - 74043 - elf_loader_entry, Start B - 75610 - auth_hash_seg_entry, Start B - 75871 - auth_hash_seg_exit, Start B - 90062 - elf_segs_hash_verify_entry, Start B - 148922 - PBL, End B - 170342 - SBL1, Start B - 231739 - boot_flash_init, Start D - 30 - boot_flash_init, Delta B - 238662 - boot_config_data_table_init, Start D - 5642 - boot_config_data_table_init, Delta - (0 Bytes) B - 249276 - CDT version:3,Platform ID:11,Major ID:1,Minor ID:0,Subtype:12 B - 257054 - pm_device_init, Start B - 260378 - pm_device_init, TEST - MSM8909 detected B - 266051 - pm_device_init, INFO - PM8909 is selected B - 280783 - PM_SET_VAL:Skip D - 22112 - pm_device_init, Delta B - 282186 - sbl1_ddr_set_params, Start B - 284565 - cpr_init, Start D - 0 - cpr_init, Delta B - 290207 - Pre_DDR_clock_init, Start D - 183 - Pre_DDR_clock_init, Delta D - 0 - sbl1_ddr_set_params, Delta B - 303139 - pm_driver_init, Start B - 309941 - --> Charge init B - 3939 - battery voltage B - 313448 - boot up B - 10 - Current status D - 10614 - pm_driver_init, Delta B - 325557 - clock_init, Start D - 152 - clock_init, Delta B - 325923 - Image Load, Start D - 22814 - QSEE Image Loaded, Delta - (460120 Bytes) B - 348767 - Image Load, Start D - 549 - SEC Image Loaded, Delta - (2048 Bytes) B - 357063 - sbl1_efs_handle_cookies, Start D - 762 - sbl1_efs_handle_cookies, Delta B - 363773 - Image Load, Start D - 14731 - RPM Image Loaded, Delta - (154076 Bytes) B - 378535 - Image Load, Start D - 19551 - APPSBL Image Loaded, Delta - (466512 Bytes) B - 398147 - QSEE Execution, Start D - 335 - QSEE Execution, Delta B - 403881 - SBL1, End D - 235826 - SBL1, Delta S - Throughput, 33000 KB/s (1082756 Bytes, 32538 us) S - DDR Frequency, 400 MHz