Booting error in L4android for Exynos 5250.

Adam Lackorzynski adam at os.inf.tu-dresden.de
Wed May 27 00:19:27 CEST 2015


On Wed May 20, 2015 at 11:08:00 +0800, Youren Shen wrote:
> > On Wed May 13, 2015 at 22:23:18 +0800, Youren Shen wrote:
> > > I'm trying to booting L4Android in Exynos 5250 platform. I got some
> > > questions. If anyone can give me any direction or document, It will be
> > very
> > > helpful.
> > >
> > > 1, How to edit this vbus and devs file to match my platform?
> > > For example, if I want replace the MOUSE in vbus with TOUCHSCREEN, what
> > > should I write to determine the driver of the touchscreen, and the
> > register
> > > address of the driver?
> > > It seems the .hid can assign the driver? And the MMio can remap the
> > address
> > > of the IO for driver?
> >
> > A vbus defines the resources (IRQs and MMIO) for a whole client, i.e.
> > it's not per driver but per client (e.g. L4Linux). For the touchscreen
> > you need to give the MMIO regions and IRQs that the touchscreen driver
> > is using.
> >
> > > 2, As for GUI driver, what the mag and fb-drv do ? Should I write one
> >
> > The fb-drv is the framebuffer driver, i.e. the driver that maps some
> > memory in such a way to the framebuffer hardware that something appears
> > on the screen. mag is a small window manager that makes multiple
> > windows, that you can drag around, out of the single hardware
> > framebuffer.
> >
> > > driver in L4RE or I can reuse the driver in Linux?
> >
> > Reusing the driver from L4Linux is possible but typically framebuffer
> > drivers are reasonable small to be implemented standalone.
> >
> > > *For this two question I just need some guide*, I can't find details
> > > explanation of the file or tutorial in Wiki page.
> > >
> > > Thank you very much!
> > >
> > > Also I got some new error when booting. The system mount failed. Would
> > you
> > > mind to take a look?
> > >
> > > RAMDISK: Loading 1024KiB [1 disk] into ram disk... done.
> > >
> > > EXT4-fs (ram0): couldn't mount as ext3 due to feature incompatibilities
> > >
> > > EXT4-fs (ram0): mounting ext2 file system using the ext4 subsystem
> > >
> > > EXT4-fs warning (device ram0): ext4_update_dynamic_rev:701: updating to
> > rev
> > > 1 bd
> > > EXT4-fs (ram0): mounted filesystem without journal. Opts: (null)
> > >
> > > VFS: Mounted root (ext2 filesystem) on device 1:0.
> > >
> > > Freeing unused kernel memory: 164K (02356000 - 0237f000)
> > >
> > > init: cannot open '/initlogo.rle'
> > >
> > > EXT4-fs (ram0): re-mounted. Opts: (null)
> > >
> > > init: Unable to open persistent property directory /data/property errno:
> > 2
> > >
> > > init (1): /proc/1/oom_adj is deprecated, please use /proc/1/oom_score_adj
> > > inste.
> > > init: cannot find '/system/bin/servicemanager', disabling
> > 'servicemanager'
> > > init: cannot find '/system/bin/vold', disabling 'vold'
> >
> > Looks like the system partition could not be mounted. Where should it
> > be?
> >
> > I'm using the image and config files that L4Android.org supplied.
> I copied the two image file(root-arm-ginger.img and system-arm-ginger.img)
> to l4/build/bin/$arch/l4f
> 
> So here is the module list:
> 
> *entry l4android-arm*
> *roottask moe rom/l4_gingerbread-arm.cfg*
> *kernel fiasco -serial_esc*
> *module l4re*
> *module ned*
> *module io*
> *module mag*
> *module fb-drv*
> *module l4_gingerbread-arm.cfg*
> *module arm-rv-eb.devs*
> *module l4_android-arm.vbus*
> *module vmlinuz.android*
> *module root-arm-ginger.img*
> *module system-arm-ginger.img*
> 
> And here is the parameter of loader:start in ned script.
> 
> 
> *"rom/" .. lxname .. " console=ttyLv0 androidboot.console=ttyLv0 mem=256M
> l4bdds.add=rom/system-arm-ginger.img,rw boot=local android.ril=ttyLv1
> ip=dhcp l4x_rd=rom/root-arm-ginger.img rw root=1:0 ramdisk_size=1500
> init=/init --debug l4fb.touchscreen=1*
> 
> In the root-arm-ginger.img file, the init script should mount the /system:
> 
> *mount cramfs /l4bdds0 /system
> **mount cramfs /l4bdds0 /system ro remount
> **mount tmpfs tmpfs /data size=32M*
> 
> But it failed.
> 
> I check the CRAMFS and it's enable in Linux kernel. Then I have  no idea
> about what can cause this /system mount error.

Hmm. Debugging Android at those early stages always felt tricky to me.
What you should check is whether the system-img could mount at all. For
that you can replace root-arm-ginger.img with ramdisk-arm.rd and see
whether mounting l4bdds0 is ok in itself my mounting it by hand.




Adam
-- 
Adam                 adam at os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/



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