Dragonboard/APQ8060A
Contents
- 1 Features
- 2 APQ8060A Linux upstream work
- 2.1 Getting gcc-armel on Debian
- 2.2 Updating environment
- 2.3 Get the code
- 2.4 Building jb_2.5
- 2.5 Building linux-msm
- 2.6 Getting your initrd
- 2.7 Creating your own ramdisk
- 2.8 Enabling debug
- 2.9 Disabling a few Android config options
- 2.10 Enabling APQ8060A
- 2.11 Latest boot log
- 2.12 Generating initial boot image
Features
- APQ8060 CPU - Snapdragon_S3_(Scorpion)#Basic_Features
- Adreno 220 GPU
- PMICs (PM8058+PM8901)
- 1500mAH battery
- Display (3.61” WVGA)
- Daughter cards
- Connectivity card
- Qualcomm WCN1314 WLAN
- Qualcomm WCN2243 BT
- Sensor card
- Pressure and temperature
- 3-axis accelerometer
- 3-axis gyro
- Proximity and ambient light
- 3-axis compass
- Connectivity card
- Cameras
- 5MP “main” camera
- 1MP camera for video telephony
- Keypad
- Connectors
- 20pin JTAG card
- DE-9F RS-232
- Mini-USB port
- 2x SIM
- 2X SDIO
- RJ-45 Ethernet
- 3.5mm TRS Stereo Audio
- Test points
- MIPI-CSI (camera)
- MIPI-DSI (display)
- GPIOs
- Parallel bus (EBI2)
APQ8060A Linux upstream work
This documentation is for folks who who want to work on ramping up linux upstream development based on APQ8060A. APQ8060A is based on a family of chipsets based on 8960: 8960, 8060a, 8064, 8930.
You'll need am armel toolchain installed. Below are documentation for Linux distributions.
Getting gcc-armel on Debian
Add this to your /etc/apt/sources.list:
deb http://www.emdebian.org/debian testing main
Then do
sudo apt-get update sudo apt-get install gcc-4.4-base-armel-cross
Updating environment
Add to your .bashrc:
export CROSS_COMPILE=/usr/bin/arm-linux-gnueabi-
It would also help if you have a simple script called make-arm in your PATH somewhere that does this:
make ARCH=arm O=kobj $@
Get the code
We are going to be relying on two trees, one from CAF and another one that is used for upstream development and is synched regularly to Linus. The goal is to get rid of the delta. There is an issue with the CAF git tree master branch so use the jb_2.5 branch.
git clone git://codeaurora.org/quic/la/kernel/msm.git jb_2.5 git clone git://git.kernel.org/pub/scm/linux/kernel/git/davidb/linux-msm.git
The way to think about this:
- jb_2.5: things not upstream
- linux-msm: target upstream -- you should be on the for-next branch
Building jb_2.5
mkdir kobj cp arch/arm/configs/msm8960_defconfig kobj/.config make-arm menuconfig make-arm -j 4
Building linux-msm
mkdir kobj cp arch/arm/configs/msm_defconfig kobj/.config make-arm menuconfig make-arm -j 4
Getting your initrd
For jb_2.5 you'll want to get the ramdisk that came with you original boot.img, the interweb has a script unpack-H.pl that you can use to extract it:
unpack-H.pl boot.img
Your ramdisk will be named boot.img-ramdisk.gz
Creating your own ramdisk
The Android ramdisks gzipped compressed ASCII (crc) CPIO archives. To create your own with a simple sleep init you can compile a simple init as follows:
$ cat init.c #include <stdio.h> int main(int argc, char *argv) { printf("Init has kicked off, sleeping now...\n"); sleep(999999999); } $ /usr/bin/arm-linux-gnueabi-gcc -static -o init init.c
Now to create your ramdisk:
$ ls | cpio -H crc -ov > foo.cpio $ gzip -9 foo.cpio
Your final foo.cpio.gz is your ramdisk.
Enabling debug
Enable a few kernel debugging flags:
* CONFIG_DEBUG_LL * CONFIG_EARLY_PRINTK
Kernel Hacking --> Kernel low-level debugging functions (read help!) Early printk
You do not need to enable anything under " Kernel low-level debugging port (No low-level debugging UART)", that is, you do not need CONFIG_DEBUG_ICEDCC or CONFIG_DEBUG_SEMIHOSTING.
Disabling a few Android config options
These should be disabled!
* CONFIG_ANDROID_PARANOID_NETWORK
Networking support ---> Networking options ---> Only allow certain groups to create sockets
* CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES
Device Drivers --> Staging drivers (STAGING [=y]) Android --> Android Drivers (ANDROID [=y]) Android Low Memory Killer (ANDROID_LOW_MEMORY_KILLER [=y])
Enabling APQ8060A
The jb_2.5 branch lacks some code to get the APQ8060A booted. The patches are available from Intrinsic though, and at least the first one is required to sort of boot the device. The next task is to figure out what else is needed.
With the first patch from Intrinsic applied on the jb_2.5 branch you will need to enable:
* CONFIG_MACH_APQ8060A_DRAGON
System Type ---> MSM Board Selection ---> [*] APQ8060A Based Dragonboard
Latest boot log
This is the latest boot log.. with just one pending patch applied (out of I don't know how many left) to the jb_2.5 branch to be able to start hacking.
Latest log With battery plugged in:
https://gist.github.com/mcgrof/5493467
A good boot log with the built-in shipping kernel:
https://gist.github.com/mcgrof/5470735
This is based on porting Intrinsic's changes onto the jb_2.5 kernel... waiting to see if we can post this.
Generating initial boot image
The APQ8060A will have shipped with an Android boot loader so you need to first get the kernel you built into a format it will like. This section will be expanded soon. Right now this is a placeholder for some more details to be added later.
- jb_2.5: package 8960 boot.img-ramdisk.gz --cmdline="console=ttyMSM0,115200,n8"
- linux-msm: package 8960dt --cmdline="console=ttyMSM0,115200,n8"