[Consult] our latest kernel and latest Android under arm Samsung S5PV210 with yaffs2 file system

[Consult] our latest kernel and latest Android under arm Samsung S5PV210 with yaffs2 file system

[Chen Gang F T]

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Hello all:

Consult:
  whether the latest kernel can update the latest android OS ?
    it is android 4.0 (kernel-3.0.8)
    under arm Samsung S5PV210 with yaffs2 file system

Background:
  development board:
    the core hardware is Samsung S5PV210
    the extended vendor is FriendlyARM (a Chinese vendor)
    use yaffs2 file system for android
      it seems yaffs2 is a standard file system for android.
        for my android HTC phone is also yaffs2 file system.
  finished:
    for the android kernel its own
      can compile from the source code successfully.
      can update to the development board successfully.
      only need zImages, not need additional modules.
        can start android without any files under /system/lib/modules/*
  current:
    I am trying to use our latest kernel (such as next-20130104)
      can compile from the source code successfully.
      it has no source code for yaffs2 file system.
      not know whether can update the latest kernel.
        whether match the firmwares
          it already has files for firmwares in /system/etc/firmware/*
          do not know the public latest kernel whether can match them.
        whether need special image packing
          the vendor use additional tools for image packing:
            CONFIG_INITRAMFS_SOURCE="scripts/FriendlyARM.cpio"
          do not know the public latest kernel whether also need it.

Choice:
  A) need choose another suitable branch of public kernel for it ?
  B) need additional configuration and download additional patches ?
  C) can not use latest public kernel to update latest android kernel ?
  D) none of choices above.


  welcome any members to providing suggestions or completions.

  thanks

-- 
Chen Gang

Flying Transformer

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Re: [Consult] our latest kernel and latest Android under arm Samsung S5PV210 with yaffs2 file system

[Theodore Ts'o]

On Tue, Jan 08, 2013 at 06:25:06PM +0800, Chen Gang F T wrote:
>     use yaffs2 file system for android
>       it seems yaffs2 is a standard file system for android.
>         for my android HTC phone is also yaffs2 file system.

yaffs2 is not a _standard_ file system for Android.  There may be some
phones which use it, but the much more common is either FAT (for the
older phones) or ext4.  The Google AOSP releases for pretty much all
modern Nexus phones (Galaxy Nexus and newer if I recall correctly,
certainly for GN, N4, N7, etc.) all use ext4.

>   current:
>     I am trying to use our latest kernel (such as next-20130104)
>       can compile from the source code successfully.
>       it has no source code for yaffs2 file system.

So if your existing Android device is using yaffs2, you'll need to
integrate yaffs2, since yaff2 is not in the upstream kernel.  As far
as hardware support, it will depend on the specifics of your
development board, and I'm not enough of an ARM expert to answer that
question.  Others hopefully on this list will be able to answer it.

Regards,

					- Ted

Re: [Consult] our latest kernel and latest Android under arm Samsung S5PV210 with yaffs2 file system

[Chen Gang F T]

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于 2013年01月08日 22:53, Theodore Ts'o 写道:

  firstly, thank you for your reply in details.

  :-)

> yaffs2 is not a _standard_ file system for Android.  There may be some
> phones which use it, but the much more common is either FAT (for the
> older phones) or ext4.  The Google AOSP releases for pretty much all
> modern Nexus phones (Galaxy Nexus and newer if I recall correctly,
> certainly for GN, N4, N7, etc.) all use ext4.
> 
  for development, yaffs2 may be not a _standard_ file system for Android.
  but for marketing, it is realy used as a common file system.
  as far as I know:
    some of HTC phone use it.
    some embedded developement board use it.
    it is well known in embedded area (can find many documents about it)


> 
> So if your existing Android device is using yaffs2, you'll need to
> integrate yaffs2, since yaff2 is not in the upstream kernel.  As far
> as hardware support, it will depend on the specifics of your
> development board, ...
>

  thank you for your suggestions.
  I will integrate yaffs2 to my current using kernel.


> ..., Others hopefully on this list will be able to answer it.
> 
> 
  welcome any members to reply, thanks.


  and additional consult:
    is it suitable to integrate yaffs2 into upstream kernel ?

  :-)


  thanks.

-- 
Chen Gang

Flying Transformer

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