Serial Debug on Acer A1

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One more milestone!

After combining this USB-to-Serial converter, this USB 3.0 breakout board, and this mini-USB 3.0 cable into one thing I got the following:

/galleries/dropbox/acer_a1-serial-debug.thumbnail.jpg

Which in turn granted me with the following on the serial console when I powered up the device (pastebin link):

set AMSS mode:0 (Normal)
[AMSS_LOG] ..\..\acer\l1\smem\acer_l1_smem_cmd.c - 18 : Acer smem proc comm cmd 0.
Device will now reset to get into OS!
[AMSS_LOG] ..\..\drivers\hw\src\hw.c - 681 : Acer main reset.
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 113 : HW version is DVT5.
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 132 : RF Band is EU.
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 138 : Acer AMSS Boot Check.
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 139 : magic number:A4BC385F, reason:00000000.
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 140 : AMSS SW version = A1-05.01.06, Date = Nov 24 2010, Time = 17:34:05
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 143 : Boot Check magic num 680601 87654321 6
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 144 : DDR REG CHECK 40 60 1E0 1E0
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 148 : SA Fuse value = A077
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 744 : Boot power on reason : 00000051.
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 745 : Boot reset status : 6.
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 772 : Button check reason : 00000000.
[AMSS_LOG] ..\..\..\..\..\..\..\acer\l1\boot\acer_l1_boot.c - 232 : Boot in normal mode.
[AMSS_LOG] ..\..\..\..\..\..\..\core\boot\secboot2\osbl\shared\src\osbl_aarm_boot.c - 363 : Boot aARM
on_msm_proc_comm
@@ i2c_init: HW mode
[AMSS_LOG] ..\..\services\task\mobile.c - 525 : Qualcomm SW info = 8650B-SDCAOLYM-4075
[AMSS_LOG] ..\..\services\task\mobile.c - 526 : AMSS SW version = A1-05.01.06, Date = Nov 24 2010, Time = 16:32:58
[AMSS_LOG] ..\..\services\task\mobile.c - 528 : Acer AMSS main code start -----.
[AMSS_LOG] ..\..\drivers\chg\charger.c - 1298 : Charging state machine change from 33 to 0
[AMSS_LOG] ..\..\drivers\chg\charger.c - 1298 : Charging state machine change from 0 to 32
[AMSS_LOG] ..\..\acer\l1\smem\acer_l1_smem_cmd.c - 18 : Acer smem proc comm cmd 2.
ptn 0 name='misc' start=451 len=5
ptn 1 name='recovery' start=456 len=40
ptn 2 name='boot' start=496 len=40
ptn 3 name='userdata' start=536 len=1600
ptn 4 name='system' start=2136 len=1600
ptn 5 name='cache' start=3736 len=335
ptn 6 name='kpanic' start=4071 len=16
ptn 7 name='dinfo' start=4087 len=2
ptn 8 name='setupdata' start=4089 len=3
ptn 9 name='splash1' start=4092 len=4
ptn 10 name='modem' start=24 len=156
nandid: 5500bcec maker ec device bc
nandcfg: aad40000 0004745e (initial)
nandcfg: e85408c0 0004745e (used)
load logo...
load checksum size:780
flash_read_image: block:4089~4091 success (0 errors)
flash_read_image: block:4092~4095 success (0 errors)
mddi_init(): AUO, build date Feb 18 2011-15:00:12
AVR reset#1
LCDC: HW_VER > 0.2, Power-On Seq v2!
[AMSS_LOG] ..\..\drivers\chg\charger.c - 1298 : Charging state machine change from 32 to 1
AVR reset#2
panel is 480 x 800
fail:msm_i2c_poll_notbusy,status:00002100
I2C_INTERFACE_SELECT:00000300
[AMSS_LOG] ..\..\acer\l1\smem\acer_l1_smem_cmd.c - 18 : Acer smem proc comm cmd 1.
[AMSS_LOG] ..\..\acer\l1\smem\acer_l1_smem_cmd.c - 18 : Acer smem proc comm cmd 2.
fail:I2C:Error waiting for notbusy
USB FastBoot:  V1.10.00
Machine ID:    1009000 v0
Build Date:    Feb 18 2011, 14:59:50
HW version:    V1.0
AMSS version:  A1-05.01.06
usb_init_basic
usb_chg_detect_type: AC Charger Detected!
get AMSS mode:0 (Normal)
boot_reason=00000000
@@BUILDID=Acer_LiquidE_4.008.08_EMEA-VFIT
on_msm_proc_comm
Check 512MB: true
sn[0]:00000020
sn[1]:00000045
sn[2]:00000095
sn[3]:00000018
sn[4]:00000019
sn[5]:00000005
sn[6]:00000000
sn[7]:00000000
sn[8]:00000000
sn[9]:00000000
sn[10]:00000000
sn[11]:00000000
serialno:025459819150
@@ i2c_init: GPIO mode
@@ i2c_init: HW mode
[AMSS_LOG] ..\..\acer\l1\smem\acer_l1_smem_cmd.c - 18 : Acer smem proc comm cmd 2.
boot_reason=00000000
SMEM: disable Modem UART messages(2)
check bat_cap
read battery:  6342,6819=92%%
** BOOTING LINUX FROM FLASH **
Check device is 256M or 512M
Check 512MB: true
Pass!
flash_read_image: block:496~535 success (0 errors)
flash_read_image: block:496~535 success (0 errors)
flash_read_image: block:496~535 success (0 errors)

kernel  @ 20008000 (2609080 bytes)
ramdisk @ 24000000 (177420 bytes)


LCM ID:00000013 000000a1 00000000
Check 512MB: true
cmdline = 'console=null hw_ver=6 amss_ver=A1-05.01.06 androidboot.serialno=025459819150 g_android.serial_number=025459819150 lcm_id=2 androidboot'

Booting Linux
Check 512MB: true

The RX pin should be connected to the GND_D, TX should go to SSTX-, GND should go to GND on the board and VBUS should be powered by 5V from the serial-to-usb converter if you are using mini USB3.0 hack. The device has serial root console immediately available if you set androidboot.console=ttyMSM2 console=ttyMSM2 (no init changes needed). Serial port settings: 115200 8N1, no hw flow control, no sw flow control.

Even if this does not yield anything useful, it is a good thing to know I can solder things and they continue working after that.

I've seen all these strings in the string dump of appsboot.mbn, amss.mbn and it is such a relief to see these are actually being used. Also it is interesting to see that the device is using a L1 bootloader. Acer L1 is actually a beTouch 200 phone running Microsoft Windows Mobile 6.5 Professional. Sweet.

One drawback for my current setup is that I can't have both serial debug and regular USB connection (though charging works), so it's time for some more soldering!

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