A13-WIFI + DEBIAN+UART

[ozbekmert]

On my board(REV-C) UART1 is placed next to the UEXT and UART0 is placed next to the GPIO-1. Then, does it mean UEXT does not contain UART11?

As far as i understand ttyS0 represents UART1. microSD card reader uses UART1. In the forum, it has been stated that UART1 can be used by two devices simultaniously

"You can not use the UART0 and SD simultaneously. https://www.olimex.com/forum/index.php?topic=420.msg2449#msg2449"
https://www.olimex.com/forum/index.php?topic=710.msg2881#msg2881

My purpose is to connect GM862-GPS to A13-wifi, but there arise couple of problem.

• ttyS0(UART1)'s Baud base is 1500000 which is not supported by Telit GM862-GPS
• If i change ttyS0 baud base, will it damages the A13-wifi since microSD card uses same console(ttyS0)? If it will be so, what i can do to avoid that problem?

Mert

[JohnS]

I think you're a bit muddled.

From the schematic, it's uart0 that is on the SD card.

Yes, ttyS0 is uart1, default 115200, and it's on UEXT.  Change its baud rate as you like.  Remember to turn off the login prompt or you'll really confuse your UEXT board!  Also, suppress console debug output on ttyS0 for the same reason.

John

[ozbekmert]

To be more precise , i put two photos of my board.
My board has 3xUART appearently.It is imposible but according to pictures i putted, me or someone made a mistake. The first UART is placed in UEXT module(uart1). Second uart is placed next to the UEXT module(according to picture). And UART 0 is placed next to the "HOME" button.   

Moreover in My script.fex file is

Code Select Expand


[product]
version = "1.0"
machine = "A13-EVB-V1.0"

[target]
boot_clock = 1008
dcdc2_vol = 1400
dcdc3_vol = 1200
ldo2_vol = 3000
ldo3_vol = 3300
ldo4_vol = 3300
pll4_freq = 960
pll6_freq = 720

[card_boot]
logical_start = 40960
sprite_gpio0 = ""

[card_boot0_para]
card_ctrl = 0
card_high_speed = 1
card_line = 4
sdc_d1 = port:PF00<2><1><default><default>
sdc_d0 = port:PF01<2><1><default><default>
sdc_clk = port:PF02<2><1><default><default>
sdc_cmd = port:PF03<2><1><default><default>
sdc_d3 = port:PF04<2><1><default><default>
sdc_d2 = port:PF05<2><1><default><default>

[twi_para]
twi_port = 0
twi_scl = port:PB00<2><1><default><default>
twi_sda = port:PB01<2><1><default><default>

[uart_para]
uart_debug_port = 1
uart_debug_tx = port:PG03<4><1><default><default>
uart_debug_rx = port:PG04<4><1><default><default>

[jtag_para]
jtag_enable = 0
jtag_ms = port:PF00<4><1><default><default>
jtag_ck = port:PF05<4><1><default><default>
jtag_do = port:PF03<4><1><default><default>
jtag_di = port:PF01<4><1><default><default>

[dram_para]
dram_baseaddr = 0x40000000
dram_clk = 408
dram_type = 3
dram_rank_num = 1
dram_chip_density = 2048
dram_io_width = 8
dram_bus_width = 16
dram_cas = 9
dram_zq = 0x7b
dram_odt_en = 0
dram_size = 512
dram_tpr0 = 0x42d899b7
dram_tpr1 = 0xa090
dram_tpr2 = 0x22a00
dram_tpr3 = 0x0
dram_tpr4 = 0x0
dram_tpr5 = 0x0
dram_emr1 = 0x0
dram_emr2 = 0x10
dram_emr3 = 0x0

[nand_para]
nand_used = 1
nand_we = port:PC00<2><default><default><default>
nand_ale = port:PC01<2><default><default><default>
nand_cle = port:PC02<2><default><default><default>
nand_ce1 = port:PC03<2><default><default><default>
nand_ce0 = port:PC04<2><default><default><default>
nand_nre = port:PC05<2><default><default><default>
nand_rb0 = port:PC06<2><default><default><default>
nand_rb1 = port:PC07<2><default><default><default>
nand_d0 = port:PC08<2><default><default><default>
nand_d1 = port:PC09<2><default><default><default>
nand_d2 = port:PC10<2><default><default><default>
nand_d3 = port:PC11<2><default><default><default>
nand_d4 = port:PC12<2><default><default><default>
nand_d5 = port:PC13<2><default><default><default>
nand_d6 = port:PC14<2><default><default><default>
nand_d7 = port:PC15<2><default><default><default>
nand_wp = ""
nand_ce2 = ""
nand_ce3 = ""
nand_ce4 = ""
nand_ce5 = ""
nand_ce6 = ""
nand_ce7 = ""
nand_spi = ""
nand_ndqs = port:PC19<2><default><default><default>

[mali_para]
mali_used = 1
mali_clkdiv = 2

[twi0_para]
twi0_used = 1
twi0_scl = port:PB00<2><default><default><default>
twi0_sda = port:PB01<2><default><default><default>

[twi1_para]
twi1_used = 1
twi1_scl = port:PB15<2><default><default><default>
twi1_sda = port:PB16<2><default><default><default>

[twi2_para]
twi2_used = 1
twi2_scl = port:PB17<2><default><default><default>
twi2_sda = port:PB18<2><default><default><default>

[uart_para0]
uart_used = 0
uart_port = 0
uart_type = 2
uart_tx = port:PB19<2><1><default><default>
uart_rx = port:PB20<2><1><default><default>

[uart_para1]
uart_used = 1
uart_port = 1
uart_type = 2
uart_tx = port:PG03<4><1><default><default>
uart_rx = port:PG04<4><1><default><default>


[spi1_para]
spi_used = 0
spi_cs0 = port:PG09<2><default><default><default>
spi_cs1 = port:PG13<2><default><default><default>
spi_sclk = port:PG10<2><default><default><default>
spi_mosi = port:PG11<2><default><default><default>
spi_miso = port:PG12<2><default><default><default>

[spi2_para]
spi_used = 1
spi_cs0 = port:PE00<4><default><default><default>
spi_sclk = port:PE01<4><default><default><default>
spi_mosi = port:PB02<4><default><default><default>
spi_miso = port:PB03<4><default><default><default>

[rtp_para]
rtp_used = 1
rtp_screen_size = 5
rtp_regidity_level = 5
rtp_press_threshold_enable = 0
rtp_press_threshold = 0x1f40
rtp_sensitive_level = 0xf
rtp_exchange_x_y_flag = 0

[ctp_para]
ctp_used = 0
ctp_name = "ft5x_ts"
ctp_twi_id = 2
ctp_twi_addr = 0x70
ctp_screen_max_x = 800
ctp_screen_max_y = 480
ctp_revert_x_flag = 0
ctp_revert_y_flag = 0
ctp_exchange_x_y_flag = 0
ctp_int_port = port:PH21<6><default><default><default>
ctp_wakeup = port:PB13<1><default><default><1>
ctp_io_port = port:PH21<0><default><default><default>

[tkey_para]
tkey_used = 0
tkey_name = "hv_keypad"
tkey_twi_id = 2
tkey_twi_addr = 0x62
tkey_int = ""

[motor_para]
motor_used = 0
motor_shake = ""

[disp_init]
disp_init_enable = 1
disp_mode = 0
screen0_output_type = 1
screen0_output_mode = 5
screen1_output_type = 1
screen1_output_mode = 5
fb0_framebuffer_num = 2
fb0_format = 9
fb0_pixel_sequence = 2
fb0_scaler_mode_enable = 0
fb1_framebuffer_num = 2
fb1_format = 9
fb1_pixel_sequence = 2
fb1_scaler_mode_enable = 0

[lcd0_para]
lcd_used = 1
lcd_x = 800
lcd_y = 600
lcd_dclk_freq = 40
lcd_pwm_not_used = 0
lcd_pwm_ch = 0
lcd_pwm_freq = 10000
lcd_pwm_pol = 0
lcd_if = 0
lcd_hbp = 222
lcd_ht = 1056
lcd_vbp = 23
lcd_vt = 1256
lcd_hv_if = 0
lcd_hv_smode = 0
lcd_hv_s888_if = 0
lcd_hv_syuv_if = 0
lcd_hv_vspw = 1
lcd_hv_hspw = 56
lcd_lvds_ch = 0
lcd_lvds_mode = 0
lcd_lvds_bitwidth = 0
lcd_lvds_io_cross = 0
lcd_cpu_if = 0
lcd_frm = 1
lcd_io_cfg0 = 268435456
lcd_gamma_correction_en = 0
lcd_gamma_tbl_0 = 0x0
lcd_gamma_tbl_1 = 0x10101
lcd_gamma_tbl_255 = 0xffffff
lcd_bl_en_used = 1
lcd_bl_en = port:power1<1><0><default><1>
lcd_power_used = 1
lcd_power = port:power0<1><0><default><1>
lcd_pwm_used = 1
lcd_pwm = port:PB02<2><0><default><default>
lcd_gpio_0 = ""
lcd_gpio_1 = ""
lcd_gpio_2 = ""
lcd_gpio_3 = ""
lcdd0 = port:PD00<2><0><default><default>
lcdd1 = port:PD01<2><0><default><default>
lcdd2 = port:PD02<2><0><default><default>
lcdd3 = port:PD03<2><0><default><default>
lcdd4 = port:PD04<2><0><default><default>
lcdd5 = port:PD05<2><0><default><default>
lcdd6 = port:PD06<2><0><default><default>
lcdd7 = port:PD07<2><0><default><default>
lcdd8 = port:PD08<2><0><default><default>
lcdd9 = port:PD09<2><0><default><default>
lcdd10 = port:PD10<2><0><default><default>
lcdd11 = port:PD11<2><0><default><default>
lcdd12 = port:PD12<2><0><default><default>
lcdd13 = port:PD13<2><0><default><default>
lcdd14 = port:PD14<2><0><default><default>
lcdd15 = port:PD15<2><0><default><default>
lcdd16 = port:PD16<2><0><default><default>
lcdd17 = port:PD17<2><0><default><default>
lcdd18 = port:PD18<2><0><default><default>
lcdd19 = port:PD19<2><0><default><default>
lcdd20 = port:PD20<2><0><default><default>
lcdd21 = port:PD21<2><0><default><default>
lcdd22 = port:PD22<2><0><default><default>
lcdd23 = port:PD23<2><0><default><default>
lcdclk = port:PD24<2><0><default><default>
lcdde = port:PD25<2><0><default><default>
lcdhsync = port:PD26<2><0><default><default>
lcdvsync = port:PD27<2><0><default><default>

[tv_out_dac_para]
dac_used = 1
dac0_src = 0

[hdmi_para]
hdmi_used = 0

[csi0_para]
csi_used = 0
csi_mode = 0
csi_dev_qty = 1
csi_stby_mode = 1
csi_mname = "gc0308"
csi_twi_id = 2
csi_twi_addr = 0x42
csi_if = 0
csi_vflip = 0
csi_hflip = 1
csi_iovdd = ""
csi_avdd = ""
csi_dvdd = ""
csi_flash_pol = 1
csi_mname_b = ""
csi_twi_id_b = 1
csi_twi_addr_b = 0x78
csi_if_b = 0
csi_vflip_b = 1
csi_hflip_b = 0
csi_iovdd_b = ""
csi_avdd_b = ""
csi_dvdd_b = ""
csi_flash_pol_b = 1
csi_pck = port:PE00<3><default><default><default>
csi_ck = port:PE01<3><default><default><default>
csi_hsync = port:PE02<3><default><default><default>
csi_vsync = port:PE03<3><default><default><default>
csi_d0 = port:PE04<3><default><default><default>
csi_d1 = port:PE05<3><default><default><default>
csi_d2 = port:PE06<3><default><default><default>
csi_d3 = port:PE07<3><default><default><default>
csi_d4 = port:PE08<3><default><default><default>
csi_d5 = port:PE09<3><default><default><default>
csi_d6 = port:PE10<3><default><default><default>
csi_d7 = port:PE11<3><default><default><default>
csi_reset = port:power3<1><default><default><0>
csi_power_en = ""
csi_stby = port:PB10<1><default><default><1>
csi_flash = ""
csi_af_en = ""
csi_reset_b = ""
csi_power_en_b = ""
csi_stby_b = ""
csi_flash_b = ""
csi_af_en_b = ""

[csi1_para]
csi_used = 0
csi_mode = 0
csi_dev_qty = 1
csi_stby_mode = 1
csi_mname = ""
csi_twi_id = 1
csi_twi_addr = 0xba
csi_if = 0
csi_vflip = 0
csi_hflip = 0
csi_iovdd = ""
csi_avdd = ""
csi_dvdd = ""
csi_flash_pol = 1
csi_mname_b = ""
csi_twi_id_b = 1
csi_twi_addr_b = 0x78
csi_if_b = 0
csi_vflip_b = 1
csi_hflip_b = 0
csi_iovdd_b = ""
csi_avdd_b = ""
csi_dvdd_b = ""
csi_flash_pol_b = 1
csi_reset = ""
csi_power_en = ""
csi_stby = ""
csi_flash = ""
csi_af_en = ""
csi_reset_b = ""
csi_power_en_b = ""
csi_stby_b = ""
csi_flash_b = ""
csi_af_en_b = ""

[mmc0_para]
sdc_used = 1
sdc_detmode = 1
bus_width = 4
sdc_d1 = port:PF00<2><1><2><default>
sdc_d0 = port:PF01<2><1><2><default>
sdc_clk = port:PF02<2><1><2><default>
sdc_cmd = port:PF03<2><1><2><default>
sdc_d3 = port:PF04<2><1><2><default>
sdc_d2 = port:PF05<2><1><2><default>
sdc_det = port:PG00<0><1><default><default>
sdc_use_wp = 0
sdc_wp = ""

[mmc1_para]
sdc_used = 0
sdc_detmode = ""
bus_width = ""
sdc_cmd = ""
sdc_clk = ""
sdc_d0 = ""
sdc_d1 = ""
sdc_d2 = ""
sdc_d3 = ""
sdc_det = ""
sdc_use_wp = ""
sdc_wp = ""

[mmc2_para]
sdc_used = 1
sdc_detmode = 3
bus_width = 4
sdc_cmd = port:PE08<4><1><2><default>
sdc_clk = port:PE09<4><1><2><default>
sdc_d0 = port:PE04<4><1><2><default>
sdc_d1 = port:PE05<4><1><2><default>
sdc_d2 = port:PE06<4><1><2><default>
sdc_d3 = port:PE07<4><1><2><default>
sdc_det = ""
sdc_use_wp = 0
sdc_wp = ""

[ms_para]
ms_used = 0
ms_bs = ""
ms_clk = ""
ms_d0 = ""
ms_d1 = ""
ms_d2 = ""
ms_d3 = ""
ms_det = ""

[keypad_para]
kp_used = 0
kp_in_size = ""
kp_out_size = ""
kp_in0 = ""
kp_in1 = ""
kp_in2 = ""
kp_in3 = ""
kp_in4 = ""
kp_in5 = ""
kp_in6 = ""
kp_in7 = ""
kp_out0 = ""
kp_out1 = ""
kp_out2 = ""
kp_out3 = ""
kp_out4 = ""
kp_out5 = ""
kp_out6 = ""
kp_out7 = ""

[usbc0]
usb_used = 1
usb_port_type = 2
usb_detect_type = 1
usb_id_gpio = port:PG02<0><1><default><default>
usb_det_vbus_gpio = port:PG01<0><0><default><default>
usb_drv_vbus_gpio = port:PG12<1><0><default><0>
usb_host_init_state = 0

[usbc1]
usb_used = 1
usb_port_type = 1
usb_detect_type = 0
usb_id_gpio = ""
usb_det_vbus_gpio = ""
usb_drv_vbus_gpio = port:PG11<1><0><default><0>
usb_host_init_state = 1

[usb_feature]
vendor_id = 6353
mass_storage_id = 1
adb_id = 2
manufacturer_name = "USB Developer"
product_name = "Android"
serial_number = "20080411"

[msc_feature]
vendor_name = "USB 2.0"
product_name = "USB Flash Driver"
release = 100
luns = 3

[gsensor_para]
gsensor_used = 0
gsensor_name = "bma222"
gsensor_twi_id = 1
gsensor_twi_addr = 0x18
gsensor_int1 = ""
gsensor_int2 = ""

[gps_para]
gps_used = 0
gps_spi_id = ""
gps_spi_cs_num = ""
gps_lradc = ""
gps_clk = ""
gps_sign = ""
gps_mag = ""
gps_vcc_en = ""
gps_osc_en = ""
gps_rx_en = ""

[sdio_wifi_para]
sdio_wifi_used = 0
sdio_wifi_sdc_id = ""
sdio_wifi_mod_sel = ""

[usb_wifi_para]
usb_wifi_used = 1
usb_wifi_usbc_num = 1

[3g_para]
3g_used = 0
3g_name = ""
3g_usbc_num = ""
3g_on_off = ""
3g_reset = ""
3g_poweron = ""
3g_wakeup_out = ""
3g_wakeup_in = ""

[gy_para]
gy_used = 0
gy_twi_id = 1
gy_twi_addr = 0
gy_int1 = ""
gy_int2 = ""

[ls_para]
ls_used = 1
ls_name = "ltr501als"
ls_twi_id = 1
ls_twi_addr = ""
ls_int = ""

[compass_para]
compass_used = 0
compass_twi_id = ""
compass_twi_addr = ""
compass_int = ""

[bt_para]
bt_used = 0
bt_uart_id = ""
bt_mod_type = ""

[i2s_para]
i2s_used = 0
i2s_channel = ""
i2s_mclk = ""
i2s_bclk = ""
i2s_lrclk = ""
i2s_dout0 = ""
i2s_dout1 = ""
i2s_dout2 = ""
i2s_dout3 = ""
i2s_din = ""

[spdif_para]
spdif_used = 0
spdif_mclk = ""
spdif_dout = ""
spdif_din = ""

[audio_para]
audio_used = 1
audio_pa_ctrl = port:PG10<1><default><default><0>

[ir_para]
ir_used = 0
ir0_rx = port:PB04<2><default><default><default>

[rtc_para]
rtc_used = 1
rtc_name = "pcf8563"
rtc_twi_id = 1
rtc_twi_addr = 81

[pmu_para]
pmu_used = 1
pmu_twi_addr = 52
pmu_twi_id = 0
pmu_irq_id = 0
pmu_battery_rdc = 200
pmu_battery_cap = 2600
pmu_init_chgcur = 300
pmu_earlysuspend_chgcur = 600
pmu_suspend_chgcur = 1000
pmu_resume_chgcur = 300
pmu_shutdown_chgcur = 1000
pmu_init_chgvol = 4200
pmu_init_chgend_rate = 15
pmu_init_chg_enabled = 1
pmu_init_adc_freq = 100
pmu_init_adc_freqc = 100
pmu_init_chg_pretime = 50
pmu_init_chg_csttime = 720
pmu_bat_para1 = 0
pmu_bat_para2 = 0
pmu_bat_para3 = 1
pmu_bat_para4 = 5
pmu_bat_para5 = 7
pmu_bat_para6 = 13
pmu_bat_para7 = 16
pmu_bat_para8 = 26
pmu_bat_para9 = 36
pmu_bat_para10 = 46
pmu_bat_para11 = 53
pmu_bat_para12 = 61
pmu_bat_para13 = 73
pmu_bat_para14 = 84
pmu_bat_para15 = 92
pmu_bat_para16 = 100
pmu_usbvol = 4000
pmu_usbcur = 0
pmu_usbvol_pc = 4000
pmu_usbcur_pc = 0
pmu_pwroff_vol = 3300
pmu_pwron_vol = 2900
pmu_pekoff_time = 6000
pmu_pekoff_en = 1
pmu_peklong_time = 1500
pmu_pekon_time = 1000
pmu_pwrok_time = 64
pmu_pwrnoe_time = 2000
pmu_intotp_en = 1
pmu_used2 = 0
pmu_adpdet = ""
pmu_init_chgcur2 = 400
pmu_earlysuspend_chgcur2 = 600
pmu_suspend_chgcur2 = 1200
pmu_resume_chgcur2 = 400
pmu_shutdown_chgcur2 = 1200
pmu_suspendpwroff_vol = 3500
pmu_batdeten = 1

[recovery_key]
key_min = 4
key_max = 6

[gpio_para]
gpio_used = 1
gpio_num = 5
gpio_pin_1 = port:PB02<1><0><default><default>
gpio_pin_2 = port:PB03<1><0><default><default>
gpio_pin_3 = port:PB04<1><0><default><default>
gpio_pin_4 = port:PB05<1><0><default><default>
gpio_pin_5 = port:PG09<1><1><default><default>



It is quite clear that

Code Select Expand


  uart_tx = port:PB19<2><1><default><default>
  uart_rx = port:PB20<2><1><default><default>

UART0 uses PB19&PB20 which is not valid pin assigmnent. By the way this script.bin is taken from A13 Debian  + xfce flashable image(R9)

Code Select Expand


uart_tx = port:PG03<4><1><default><default>
uart_rx = port:PG04<4><1><default><default>

UART1 connected to PG03 and PG04 (pin 115 pin 116). According to datasheet , PIN 11(5-6) is on UEXT module.

1) Which UART1 represents the real UART1? Why there placed second UART1?
2) How can i suppress console debug output on ttyS0?
"I disabled uart_debug on script.bin" does suppress console debug output on ttyS0?
2) What is the CMOS TTL Level corresponding UART?

http://imageshack.us/f/822/20130127053.jpg/

http://imageshack.us/f/542/20130127052.jpg/

[JohnS]

Looks like you have the same as me: 2 uarts.  I explained before and it is the same.

I cannot see why you THINK you have 3 but seems to me you don't.

Please just refer to my previous reply.

[vinifr]

Hi,

One way I found consists of disabling virtual terminal in /dev/ttyS0 in order to release uart1 (I do not know enable UART0) and to use virtual terminals in /dev/tty[1-6].

Enable /dev/tty[1-6] and disable /dev/ttyS0 in /etc/inittab

Code Select Expand


1:2345:respawn:/sbin/getty 38400 tty1
2:23:respawn:/sbin/getty 38400 tty2
3:23:respawn:/sbin/getty 38400 tty3
4:23:respawn:/sbin/getty 38400 tty4
5:23:respawn:/sbin/getty 38400 tty5
6:23:respawn:/sbin/getty 38400 tty6

#T0:2345:respawn:/sbin/getty -L ttyS0 115200 linux


Now load fbcon.ko and lcd.ko if not already loaded:
# modprobe fbcon
# modprobe lcd
From here you can connect a VGA monitor in and logon.

You can now connect a gps in UEXT(UART1)...

I used the example from this site: https://sites.google.com/site/bifferboard/Home/howto/connect-to-a-serial-gps

UART1: http://dl.dropbox.com/u/22273442/A13/UEXT_UART1.jpg

/dev/tty1 in vga monitor: http://www.youtube.com/watch?v=ZZV4sZ3Z2Lc

[mike1968]

Hi,

One way I found consists of disabling virtual terminal in /dev/ttyS0 in order to release uart1 (I do not know enable UART0) and to use virtual terminals in /dev/tty[1-6].

Enable /dev/tty[1-6] and disable /dev/ttyS0 in /etc/inittab

Code Select Expand


1:2345:respawn:/sbin/getty 38400 tty1
2:23:respawn:/sbin/getty 38400 tty2
3:23:respawn:/sbin/getty 38400 tty3
4:23:respawn:/sbin/getty 38400 tty4
5:23:respawn:/sbin/getty 38400 tty5
6:23:respawn:/sbin/getty 38400 tty6

#T0:2345:respawn:/sbin/getty -L ttyS0 115200 linux


Now load fbcon.ko and lcd.ko if not already loaded:
# modprobe fbcon
# modprobe lcd
From here you can connect a VGA monitor in and logon.

You can now connect a gps in UEXT(UART1)...

I used the example from this site: https://sites.google.com/site/bifferboard/Home/howto/connect-to-a-serial-gps

UART1: http://dl.dropbox.com/u/22273442/A13/UEXT_UART1.jpg

/dev/tty1 in vga monitor: http://www.youtube.com/watch?v=ZZV4sZ3Z2Lc

How can i disable /dev/ttyS0 in jeff's verion r15 ubuntu?
I could not find the init file

[vaishali]

hi mike1968 ,


Even i am facing the same problem as you have.
I have R18 image of jwischka.
Were you able to use UART as serial port.
I want to connect RS232 connection to UART port.
But even i am also not getting the /etc/inttab file or the other ways to change ttyS0 from debug mode.
If you know then please reply how should i use it.
thanks in advance.   

[vaishali]

ok so finally got the solution for my problem.


I need to buy rs232 module to convert UART1 into rs232.

[vinifr]

hi mike, edit /etc/default/console-setup, ACTIVE_CONSOLES

But there is other way, enable console via USB if you have not VGA monitor and disable /dev/ttyS0

<wingrime> you can try use usb gadget as console
<wingrime> CONFIG_USB_G_SERIAL
<wingrime> console=ttyUSB0
vinifm> do you use OTG or HOST?
<wingrime> host only
<wingrime> I have tablet
<techn__> vinifm: http://linux-sunxi.org/MicroSD_Breakout