Dobrica Pavlinušić's random unstructured stuff

Galaxy Nexus i9250: Revision 25

Schematics and service manual for i9250: Samsung_i9250_schem_sm.rar

Contents

BLE
GSM modem over serial port
HID keyboard
Unlegacy Android

kernel

OMAP4 USB boot
Odin
serial
UART modes
PostmarketOS
u-boot

127|root@maguro:/ # cat /proc/cpuinfo                                          
Processor       : ARMv7 Processor rev 10 (v7l)
processor       : 0
BogoMIPS        : 1194.24

processor       : 1
BogoMIPS        : 1194.24

Features        : swp half thumb fastmult vfp edsp thumbee neon vfpv3 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x2
CPU part        : 0xc09
CPU revision    : 10

Hardware        : Tuna
Revision        : 0009
Serial          : 014994b30201c013

BLE

https://github.com/metc/galaxy-nexus-ble

GSM modem over serial port

https://github.com/2b-as/xgoldmon

HID keyboard

https://github.com/pelya/android-keyboard-gadget

Unlegacy Android

ASOP for OMAP4 devices:

https://forum.xda-developers.com/galaxy-nexus/development/rom-omap4-aosp-project-t3334574

https://github.com/Unlegacy-Android/

kernel

http://unlegacy-android.cf/

https://github.com/Unlegacy-Android/android_kernel_samsung_tuna

dpavlin@klin:/virtual/android/galaxy-nexus$ git clone https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/

dpavlin@klin:/virtual/android/galaxy-nexus/omap$ git checkout -b asop-7.1 unlegacy/aosp-7.1

dpavlin@klin:/virtual/android/galaxy-nexus/omap$ make tuna_defconfig ARCH=arm

dpavlin@klin:/virtual/android/galaxy-nexus/omap$ cp include/linux/compiler-gcc4.h include/linux/compiler-gcc5.h


dpavlin@klin:/virtual/android/galaxy-nexus/omap$ make -j9 ARCH=arm CROSS_COMPILE=arm-none-eabi-

OMAP4 USB boot

Somewhat interesting things that I can take a look at some time in the future:

https://github.com/swetland/omap4boot

newer(ish) version is on https://github.com/dmitry-pervushin/usbboot-omap4

To compile it needs following change:

dpavlin@nuc:/nuc/Galaxy-Nexus-i9250/usbboot-omap4$ git diff
diff --git a/Makefile b/Makefile
index 2d10c73..9ea9461 100644
--- a/Makefile
+++ b/Makefile
@@ -38,7 +38,7 @@ BINDIR ?= $(DESTDIR)/usr/bin
 DATADIR ?= $(DESTDIR)/usr/share/usbboot
 DOCDIR ?= $(DESTDIR)/usr/share/doc/usbboot
 
-BOARD ?= panda
+BOARD ?= tuna
 
 TARGET_CC := $(TOOLCHAIN)gcc
 TARGET_LD := $(TOOLCHAIN)ld
diff --git a/tools/usb-linux.c b/tools/usb-linux.c
index e3492a1..09c40de 100755
--- a/tools/usb-linux.c
+++ b/tools/usb-linux.c
@@ -10,7 +10,7 @@ int linux_usb_init(void)
        r = libusb_init(&ctx);
        if (r != 0)
                return r;
-       libusb_set_debug(ctx,0x1);
+       //libusb_set_debug(ctx,0x1);
     return 0;
 }

Odin

http://glassechidna.com.au/heimdall/

serial

https://wiki.postmarketos.org/wiki/Serial_debugging#USB_debug_cable

Device	Codename	Resistor (R3)	Connected VCC
Google Galaxy Nexus (GSM)	samsung-maguro	619K ohm	No
Samsung Galaxy Mini 2	samsung-s6500d	530K ohm	No
Samsung Galaxy S4 Mini LTE	samsung-i9195	619K ohm	No
Samsung Galaxy S5	samsung-klte	619K ohm	No

It seems that other suggestion is 150k from https://redmine.replicant.us/projects/replicant/wiki/SamsungSerial - I will have to test which value works

UART modes

https://wiki.postmarketos.org/wiki/Micro-USB_Interface_Controller

Resistance	Jig	Boot
150k	Inactive	Inactive
523k	Active	Inactive
619k	Active	Active

RID_USB_OTG_MODE,	/* 0 0 0 0 0 	GND 		USB OTG Mode              */
RID_AUD_SEND_END_BTN,	/* 0 0 0 0 1 	2K		Audio Send_End Button*/
RID_AUD_REMOTE_S1_BTN,	/* 0 0 0 1 0 	2.604K		Audio Remote S1 Button */
RID_AUD_REMOTE_S2_BTN,	/* 0 0 0 1 1 	3.208K		Audio Remote S2 Button                         */
RID_AUD_REMOTE_S3_BTN,	/* 0 0 1 0 0 	4.014K		Audio Remote S3 Button */
RID_AUD_REMOTE_S4_BTN,	/* 0 0 1 0 1 	4.82K		Audio Remote S4 Button */
RID_AUD_REMOTE_S5_BTN,	/* 0 0 1 1 0 	6.03K		Audio Remote S5 Button */
RID_AUD_REMOTE_S6_BTN,	/* 0 0 1 1 1 	8.03K		Audio Remote S6 Button */
RID_AUD_REMOTE_S7_BTN,	/* 0 1 0 0 0 	10.03K		Audio Remote S7 Button */
RID_AUD_REMOTE_S8_BTN,	/* 0 1 0 0 1 	12.03K		Audio Remote S8 Button */
RID_AUD_REMOTE_S9_BTN,	/* 0 1 0 1 0 	14.46K		Audio Remote S9 Button */
RID_AUD_REMOTE_S10_BTN,	/* 0 1 0 1 1 	17.26K		Audio Remote S10 Button */
RID_AUD_REMOTE_S11_BTN,	/* 0 1 1 0 0 	20.5K		Audio Remote S11 Button */
RID_AUD_REMOTE_S12_BTN,	/* 0 1 1 0 1 	24.07K		Audio Remote S12 Button */
RID_RESERVED_1,		/* 0 1 1 1 0 	28.7K		Reserved Accessory #1 */
RID_RESERVED_2,		/* 0 1 1 1 1 	34K 		Reserved Accessory #2 */
RID_RESERVED_3,		/* 1 0 0 0 0 	40.2K		Reserved Accessory #3 */
RID_RESERVED_4,		/* 1 0 0 0 1 	49.9K		Reserved Accessory #4 */
RID_RESERVED_5,		/* 1 0 0 1 0 	64.9K		Reserved Accessory #5 */
RID_AUD_DEV_TY_2,	/* 1 0 0 1 1 	80.07K		Audio Device Type 2 */
RID_PHONE_PWD_DEV,	/* 1 0 1 0 0 	102K		Phone Powered Device */
RID_TTY_CONVERTER,	/* 1 0 1 0 1 	121K		TTY Converter */
RID_UART_CABLE,		/* 1 0 1 1 0 	150K		UART Cable */
RID_CEA936A_TY_1,	/* 1 0 1 1 1 	200K		CEA936A Type-1 Charger(1) */
RID_FM_BOOT_OFF_USB,	/* 1 1 0 0 0 	255K		Factory Mode Boot OFF-USB */
RID_FM_BOOT_ON_USB,	/* 1 1 0 0 1 	301K		Factory Mode Boot ON-USB */
RID_AUD_VDO_CABLE,	/* 1 1 0 1 0 	365K		Audio/Video Cable */
RID_CEA936A_TY_2,	/* 1 1 0 1 1 	442K		CEA936A Type-2 Charger(1) */
RID_FM_BOOT_OFF_UART,	/* 1 1 1 0 0 	523K		Factory Mode Boot OFF-UART */
RID_FM_BOOT_ON_UART,	/* 1 1 1 0 1 	619K		Factory Mode Boot ON-UART */
RID_AUD_DEV_TY_1_REMOTE, /* 1 1 1 1 0 	1000.07K	Audio Device Type 1 with Remote(1) */
RID_AUD_DEV_TY_1_SEND = RID_AUD_DEV_TY_1_REMOTE , /* 1 1 1 1 0 	1002K		Audio Device Type 1 / Only Send-End(2) */
RID_USB_MODE,		/* 1 1 1 1 1 	Open		USB Mode, Dedicated Charger or Accessory Detach */

PostmarketOS

dpavlin@nuc:/nuc/pmbootstrap$ ./pmbootstrap.py install --no-fde
[17:54:17] *** (1/5) PREPARE NATIVE CHROOT ***
[17:54:18] *** (2/5) CREATE DEVICE ROOTFS ("samsung-maguro") ***
[17:54:23] (rootfs_samsung-maguro) install
[17:54:27] (rootfs_samsung-maguro) install
[17:54:30] (rootfs_samsung-maguro) write /etc/os-release
[17:54:30] (rootfs_samsung-maguro) mkinitfs samsung-maguro
[17:54:34]  *** SET LOGIN PASSWORD FOR: 'dpavlin' ***
New password:
Retype new password:
passwd: password updated successfully
[17:54:43] NOTE: No valid keymap specified for device
[17:54:46] *** (3/5) PREPARE INSTALL BLOCKDEVICE ***
[17:54:47] (native) create samsung-maguro.img (361M)
[17:54:47] (native) mount /dev/install (samsung-maguro.img)
[17:54:47] (native) partition /dev/install (boot: 31M, root: the rest)
[17:54:47] (native) format /dev/installp2
[17:54:48] (native) mount /dev/installp2 to /mnt/install
[Tue Sep 25 17:55:21 2018] EXT4-fs (loop0p2): mounted filesystem with ordered data mode. Opts: (null)
[17:54:48] (native) format /dev/installp1 (boot, ext2), mount to /mnt/install/boot
[Tue Sep 25 17:55:21 2018] EXT4-fs (loop0p1): mounting ext2 file system using the ext4 subsystem
[Tue Sep 25 17:55:21 2018] EXT4-fs (loop0p1): mounted filesystem without journal. Opts: (null)
[17:54:48] *** (4/5) FILL INSTALL BLOCKDEVICE ***
[17:54:48] (native) copy rootfs_samsung-maguro to /mnt/install/
[17:54:53] *** (5/5) FLASHING TO DEVICE ***
[17:54:53] Run the following to flash your installation to the target device:
[17:54:53] * pmbootstrap flasher flash_rootfs
[17:54:53]   Flashes the generated rootfs image to your device:
[17:54:53]   /nuc/pmbootstrap-work/chroot_native/home/pmos/rootfs/samsung-maguro.img
[17:54:53]   (NOTE: This file has a partition table, which contains /boot and / subpartitions. That way we don't need to change the partition layout on your device.)
[17:54:53] * pmbootstrap flasher flash_kernel
[17:54:53]   Flashes the kernel + initramfs to your device:
[17:54:53]   /nuc/pmbootstrap-work/chroot_rootfs_samsung-maguro/boot
[17:54:53]   (NOTE: fastboot also supports booting the kernel/initramfs directly without flashing. Use 'pmbootstrap flasher boot' to do that.)
[17:54:53] * If the above steps do not work, you can also create symlinks to the generated files with 'pmbootstrap export' and flash outside of pmbootstrap.
[17:54:53] NOTE: chroot is still active (use 'pmbootstrap shutdown' as necessary)
[17:54:53] Done

dpavlin@nuc:/nuc/pmbootstrap$ alias pmbootstrap=/nuc/pmbootstrap/pmbootstrap.py
dpavlin@nuc:/nuc/pmbootstrap$ pmbootstrap flasher flash_rootfs
[17:57:10] (native) flash rootfs image
< waiting for any device >
[Tue Sep 25 17:59:17 2018] usb 2-3.1: new high-speed USB device number 22 using xhci_hcd
[Tue Sep 25 17:59:17 2018] usb 2-3.1: New USB device found, idVendor=18d1, idProduct=4e30, bcdDevice= 1.00
[Tue Sep 25 17:59:17 2018] usb 2-3.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[Tue Sep 25 17:59:17 2018] usb 2-3.1: Product: Android 1.0
[Tue Sep 25 17:59:17 2018] usb 2-3.1: Manufacturer: Google, Inc
[Tue Sep 25 17:59:17 2018] usb 2-3.1: SerialNumber: 014994B00C01A013
target didn't report max-download-size
Erasing 'system'...
OKAY [  0.047s]
Sending 'system' (369664 KB)...
OKAY [ 50.498s]
Writing 'system'...
OKAY [ 26.436s]
Finished. Total time: 77.024s
[18:00:02] NOTE: chroot is still active (use 'pmbootstrap shutdown' as necessary)
[18:00:02] Done
dpavlin@nuc:/nuc/pmbootstrap$ [Tue Sep 25 19:24:27 2018] usb 2-3.1: USB disconnect, device number 22
[Tue Sep 25 19:24:27 2018] usb 2-3.1: new high-speed USB device number 23 using xhci_hcd
[Tue Sep 25 19:24:27 2018] usb 2-3.1: unable to get BOS descriptor
[Tue Sep 25 19:24:27 2018] usb 2-3.1: New USB device found, idVendor=0451, idProduct=d010, bcdDevice= 0.00
[Tue Sep 25 19:24:27 2018] usb 2-3.1: New USB device strings: Mfr=33, Product=37, SerialNumber=0
[Tue Sep 25 19:24:27 2018] usb 2-3.1: Product: OMAP4440
[Tue Sep 25 19:24:27 2018] usb 2-3.1: Manufacturer: Texas Instruments
[Tue Sep 25 19:24:30 2018] usb 2-3.1: USB disconnect, device number 23