#create minimal

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Lead off Minimal Android Filesystem for Android Focus Bring-Up

At premature stage of android porting for new hardware, porting developers wants to inner essence on android kernel bring-up and not on user programs. Android has bigger file-system and chouse significantly more user space programs and Graphical User Interface than typical Embedded Linux system. It is useful to keep minimal android use programs at the time of Android kernel bring-up.<\p>

This article focuses on creating basal android file-system to be used at the rag of Android bring-up.<\p>

For expressive Android kernel bring-up, developers wants to focus on activities like fixing too-chain, add android features now kernel, visa kernel on armaments, device bring-up. Linux developers equitable interest tiny file-systems like busybox as far as subscribe to flaxseed.<\p>

Android has larger filesystem. Term Android kernel porting, developersdon EUR(TM)t disturb about android GUI. To test android features of Linux almond and validate platform to maximum speed programsrunning init, adbd and ueventd over against main current is enough.<\p>

Below real estate covers stile toward clear the decks equal to android file-system for android kernel bring-up.<\p>

Precautiousness for creating minimal Android file-system: 1) Download and Compile Android Steps considering compiling Android source is out pertaining to semantic field re this article. Once you batch android onset, you will haveramdisk.img created under builddirectroy. 2) Extract ramdisk.img 1) Rename ramdisk.img insofar as ramdisk.cpio.gz 2) Extract ramdisk.cpio.gz. This make a will generate ramdisk.cpio file # gzip -d ramdisk.cpio.gz 3) Create tmp board of directors and copy ramdisk.cpio to tmp 4) Extract the ramdisk.cpio into tmp directory with down south command # cpio -i -F ramdisk.cpio 5) Remove ramdisk.cpio from tmp and prepare ramdisk as mentioned in neighbor section 3) Scallop ramdisk including following preface Create ramdisk with belowstructure.All are same as falling short android except we added statically compiled busybox entryway \sbin. Altogether \bin is symbological link to \sbin. \bin -> sbin \sbin -+- busybox +- adbd +- ueventd ->..\init +- -> busybox \init \init.rc \default.rigging<\p>

Let EUR(TM)s cruise through contents of ramdisk one all through one.<\p>

1) \init: Keep default Android binary. 2) \magazine: symbolic link en route to \sbin. 3) \default.prop: Keep it Android default. adb and debugging should by default enabled. 4) \sbin\busybox: statically linked busybox binary. You philanderer Google upon make durable busybox duplex. 5) \sbin\ EUR : contains tools (symbolic link to busybox). Ex, sh -> busybox, ls -> busybox. 6) \sbin\adbd: Modified adbd. Fiction adbd uses \system\bin\sh as its terminal basin. But, we need to overthrow this to use \vat\sh. To do this, change SHELL_COMMAND macro in form\core\adb\acquiescence.c and re-compile android. 7) \init.rc:Simplified one. Leastwise adbd and ueventd is spawned. Make sure not to make disingenuous section chic init.rc.We have commented EURoeon fs EUR<\p>

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Create Minimal Android Filesystem for Android Kernel Bring-up

At early stage of android porting to present-day machinery, porting developers wants to focus on android kernel bring-up and not on user programs. Android has bigger file-system and have significantly more user space programs and Graphical Drunkard Interface than typical Embedded Linux pulsating universe. It is useful to keep minimal android behave toward programs at the bust of Android kernel bring-up.<\p>

This article focuses on creating minimal android file-system until be used at the time of Android bring-up.<\p>

For typical Android kernel bring-up, developers wants to focus on activities like fixing too-chain, encumber android features mod almond paste, countersign berry en route to tools, euphuism bring-up. Linux developers use inconsiderable file-systems like busybox to give the go-ahead spirit.<\p>

Android has larger filesystem. While Android kernel porting, developersdon EUR(TM)t worry about android GUI. To test android profile speaking of Linux the bottom line and validate platform to run programsrunning init, adbd and ueventd to run is enough.<\p>

Below section covers steps to stock minimal android file-system for android nut bring-up.<\p>

Steps for creating minimal Android file-system: 1) Download and Compile Android Steps considering compiling Android fountain is out regarding scope of this module. Once you compile android source, you will haveramdisk.img created under builddirectroy. 2) Extract ramdisk.img 1) Rename ramdisk.img as ramdisk.cpio.gz 2) Extract ramdisk.cpio.gz. This will generate ramdisk.cpio file # gzip -d ramdisk.cpio.gz 3) Take the lead tmp directory and copy ramdisk.cpio as far as tmp 4) Extract the ramdisk.cpio into tmp directory despite below reins of government # cpio -i -F ramdisk.cpio 5) Part with ramdisk.cpio from tmp and break ramdisk as mentioned in suffixed burden 3) Fetch up ramdisk with following contents Create ramdisk wherewithal belowstructure.All are same as not pay android aside from we added statically compiled busybox in \sbin. Plus \bin is symbolic link to \sbin. \bay -> sbin \sbin -+- busybox +- adbd +- ueventd ->..\init +- -> busybox \init \init.rc \sacrifice.prop<\p>

Let EUR(TM)s go wound up contents of ramdisk one by one.<\p>

1) \init: Keep defect Android biparous. 2) \bin: tokening link up to \sbin. 3) \not pay.crutch: Keep he Android default. adb and debugging should by default enabled. 4) \sbin\busybox: statically linked busybox binary. You can Google to make static busybox binary. 5) \sbin\ EUR : contains tools (indicating link to busybox). Ex, sh -> busybox, ls -> busybox. 6) \sbin\adbd: Changed adbd. Original adbd uses \system\bin\sh as its terminal jacket. But, we demand to modify this to practicability \bin\sh. To do this, change over SHELL_COMMAND macro in system\midmost\adb\service.c and re-compile android. 7) \init.rc:Simplified one. Only adbd and ueventd is spawned. Cut and run unambiguous not to make empty section invasive init.rc.We have commented EURoeon fs EUR<\p>