MTK IoT android modem版本軟體編譯方法介紹

隨著物聯網的快速發展，人們對物聯網產品要求也越來越高，需要物聯網設備支持4G或者5G功能，Mediatek針對客戶的需求，推出了Modem版本的物聯網產品供客戶選擇，目前支持4G的Modem產品有：MT8766,MT8788,MT8768,MT8781,MT8786；支持5G的Modem產品有MT8797,MT8771。下面我們將對大眾的4G產品MT8768為例，介紹MT8768 modem部分和AP的編譯說明。

Step1：獲取源碼：
拿到Mediatek的授權後，我們就可以取得AP和Modem 2個部分的源碼；

Step2：安裝GCC環境

For LR12A:
Codescape GCC MIPS cross-compiler v4.9.2 (2016.05-08)
It can be downloaded from :
https://codescape.mips.com/components/toolchain/2016.05-08/downloads.html
 --> Find the keyword "MTI Bare Metal Toolchain MIPS32R2-MIPS32R5, MIPS64R2-MIPS64R5 and microMIPS"
 --> Click the the button of "Linux x64"(.tar.gz) and download the Codescape GCC MIPS compiler
Or you can use the following link to download Codescape GCC MIPS compiler directly:
https://codescape.mips.com/components/toolchain/2016.05-08/Codescape.GNU.Tools.Package.2016.05-08.for.MIPS.MTI.Bare.Metal.CentOS-5.x86_64.tar.gz

For LR13:
Codescape GCC MIPS cross-compiler v6.3.0 (2017.10-08)
It can be downloaded from :
https://codescape.mips.com/components/toolchain/2017.10-08/downloads.html
 --> Find the keyword "MTI Bare Metal Toolchain MIPS32R2-MIPS32R5, MIPS64R2-MIPS64R5 and microMIPS"
 --> Click the the button of "Linux x64"(.tar.gz) and download GCC MIPS compiler
Or you can use the following link to download Codescape GCC MIPS compiler directly:
https://codescape.mips.com/components/toolchain/2017.10-08/Codescape.GNU.Tools.Package.2017.10-08.for.MIPS.MTI.Bare.Metal.CentOS-5.x86_64.tar.gz 
​

每一個晶片的Modem要求的GCC版本不一樣，我們可以參考vendor\mediatek\release_note下的說明文檔,把GCC拷貝到mcu\common\tools\GCC\MIPS\4.9.2下。

Step3: 安裝Android NDK及patch

Please make sure the following Android NDK (Native Development Kit) is appropriate for the build system:
1. Android NDK r14b (for generate modem application service package) 
Please refer to the following steps to download Android NDK:
    1. Visit Android NDK toolchain download website:             
         https://developer.android.com/ndk/downloads/older_releases.html
    2. Find the keyword "Linux 64-bit (x86)" in "Android NDK, Revision 14b (March 2017)".
    3. Click the "android-ndk-r14b-linux-x86_64.zip" to download. 
         Or you can use the following link to download Android NDK directly:
         https://dl.google.com/android/repository/android-ndk-r14b-linux-x86_64.zip

NOTE: Please unzip the zip file of Android NDK under the path "apps/NDK".

2. Apply Android NDK r14b bug fix patch (Change ID: Ic558a4b0329093241aae5d4f34ecde8d1cbb0564)
Please refer to the following steps to apply Android NDK r14b patch:
1. Visit bug fix patch page on Android Open Source Project website:
https://android-review.googlesource.com/q/Ic558a4b0329093241aae5d4f34ecde8d1cbb0564
2. click "build/core/build-binary.mk" and "build/core/default-build-commands.mk" as the right image to show the patch diffs.
3. modify the corresponfing files under "apps/NDK/android-ndk-r14b/" folder to apply the bug fix.

Step4：編譯modem源碼，首先我們進入mcu\make\projects選擇相應的工程，下面我們以TK_MD_BASIC(LWCTG_6177M_TB_8768A).mak為例。

cd mcu
 ./m "TK_MD_BASIC(LWCTG_6177M_TB_8768A).mak" new

Step5：執行modemRenameCopy.pl腳本

In ALPS codebase, run command：
perl device/mediatek/build/build/tools/modemRenameCopy.pl ./ "TK_MD_BASIC(LWCTG_6177M_TB_8768A).mak"

執行modemRenameCopy.pl腳本，這個步驟一定不能漏掉。它的作用是把所有需要拷貝到AP端的文件收集到temp_modem文件夾中(modem codebase根目錄下)，並且還會生成一個Android.mk文件。

Step 6：拷貝modem image到AP

執行modemRenameCopy.pl腳本之後，需要把temp_modem文件夾拷貝到AP。AP端路徑：
alps/vendor/mediatek/proprietary/modem/[temp_modem]

[temp_modem]文件夾拷貝到AP端之後，文件夾名可以自行更改，請和device\mediateksample\tb8768p1_64_bsp里ProjectConfig.mk定義的名字匹配custom_modem=mt6762_sp_lwctg_6177m_tb_umoly0164_prod

Step 7：編譯APPS

cd apps
./build.sh clean,build,pack all GEN93_USER

Step 8：把編譯APPS生成的文件拷貝到AP

init_rc/, 拷貝到alps/vendor/mediatek/proprietary/modem/mt6762_sp_lwctg_6177m_tb_umoly0164_prod/init_rc/
sepolicy/，拷貝到alps/vendor/mediatek/proprietary/modem/mt6762_sp_lwctg_6177m_tb_umoly0164_prod/sepolicy/
makefile/，拷貝到alps/vendor/mediatek/proprietary/modem/mt6762_sp_lwctg_6177m_tb_umoly0164_prod/makefile/
libs/， 拷貝到alps/vendor/mediatek/proprietary/modem/mt6762_sp_lwctg_6177m_tb_umoly0164_prod/libs/

Step 9，編譯整個AP

python vendor/mediatek/proprietary/scripts/releasetools/split_build_helper.py --run full_tb8768p1_64_bsp-userdebug |tee 2>&1 build.log

 編譯結束。