Hi dmitriy, Thank you so much for your great help. I have finished the vold parts, now it can handle multi SD card now.
For framework side, we plan to not handle another SD card, it will be only used for some specific application. Thank you once again. Best Regards, Jerry On 4月12日, 下午11時53分, dmitriy moskvitin <[email protected]> wrote: > Hi, Jerry Juan~ > > well, let's rock: > 1. kernel mmc/sd driver -> I have better assign with eMMC different > major number. That's just for debug + you remove some side effects in > vold. > 2. system level: vold > 2.1 which vold do you use? I'll told about /platform/system/core/ > vold. > 2.2 focus on "volume_t" structure. it's the main structure of the > vold. > so, multi devices -> multi objects of the volume_t > structure. > 2.3 media_type of your eMMC should be "media_mmc". check > uevent.c::handle_block_event(). > 2.4 Think how to application level, such as > com.android.providers.media and com.android.settings.deviceinfo will > use your resources. I mean, you have to modify notification/command > system, which linked system and framework level . You can see the part > of this system in cmd_dispatch.c. > 3. I explain determination/mount mechanism: > 1. user insert sd card; > 2. mmc/sd driver recognize it, make device object for every > partitions with unique combination of MAJOR:MINOR numbers and generate > uevent. > 3. uevent come to user-level via kernel socket > NETLINK_KOBJECT_UEVENT > 4. vold handle this uevent in uevent.c::handle_block_event() > 5. vold read boot-sector to determine, how many partitions remains > on the storage. > 6. if all partitions founded, vold will start "mount" procedure > 7. if mount succesfully finished, vold send "volume_mounted:/ > sdcard" message to com.android.server.MountListener. > 8. com.android.server.MountListener provide socket connection for > the vold from framework side. > 9. com.android.server.MountListener dispatch mesage to > com.android.server.MountService by handleEvent() method. > 10. com.android.server.MountService provide to framework logical > interpetation of vold actions, such as update icon notifications and > forward command from user to the vold. > 11. So, in our case, MountService::notifyMediaMounted () will > generate Intent.ACTION_MEDIA_MOUNTED. > 12 By this intent, will started > com.android.providers.media.MediaScanner, which will searching media > content and make database. And com.android.settings.deviceinfo.Memory > will update memory status. > 4. also, I suggest to you port or develop solution based on fs/ > innotify. to watching for android os activity. as additional, you can > use the next patch to determine wich process make an > action.http://lwn.net/Articles/307536/ "Use pid in inotify events." > > Best regards, Dmitriy. > > On 12 апр, 11:00, Jerry Juan <[email protected]> wrote: > > > Hi Dmitry, > > > Thanks for your clarification. It help us a lot to know about the > > problems. > > For vold patch, could you help to point out where need to be patched? > > As I know, the state(add/remove/change...) is only one variable, any > > other parts need to be patched? > > Thanks for your kindly help. > > > On 4月9日, 下午11時16分, dmitriy moskvitin <[email protected]> wrote: > > > > Hi, Jerry Juan~ > > > Very intresting task.... > > > Well, to manage 2 sd-card at the same time: > > > 1. patchvoldin several places, to allow it manage multi-devices at > > > same time. But,voldis just "tip of the iceberg" > > > 2. patch/add a loooot of component on framework level. As there are > > > located the main concept of sd-card usage in Android OS. > > > 3. and as last, you have to read the next thread. > > > ;)http://groups.google.com/group/android-developers/browse_thread/threa... > > > > Best regards, > > > Dmitry. > > > > On 9 апр, 12:26, Jerry Juan <[email protected]> wrote: > > > > > Really? It seems the source code only support one MMC device in the > > > > same time. > > > > And the state follow first MMC device, that should bethe reason of why > > > > the eMMC can't be mounted when SD card is inserted. > > > > > I am still finding the solution for this case. > > > > I can't let eMMC work withVOLDwhen SD card is inserted. > > > > > On 4月8日, 下午10時21分, Deva R <[email protected]> wrote: > > > > > > Hi, > > > > > I was also told that, android cant dynamically support two MMC/SD > > > > > cards., and android always treats boot device as single flash device > > > > > (assumes nand). > > > > > Curious to know why/how its like this.. > > > > > -Deva > > > > > > On Thu, Apr 8, 2010 at 11:34 AM, Jerry Juan <[email protected]> > > > > > wrote: > > > > > > Hello all, > > > > > > > My device got two MMCdevice, one is eMMC the other is for SD card. > > > > > > It seemsvoldcan't mount eMMC when SD card is exist. > > > > > > Myvold.conf want to use eMMC to replace SD card. SD card will be > > > > > > used for other purpose > > > > > > > When the SD card is exist, eMMC can't be mounted automatically. It > > > > > > shows below log. > > > > > > D/MountListener( 59): handleEvent volume_nomedia:/sdcard > > > > > > D/MountListener( 59): handleEvent ums_disabled > > > > > > D/MountListener( 59): handleEvent ums_disconnected > > > > > > > When SD card is not exist, thevoldmount eMMC successfully. > > > > > > Does anyone met this problem? > > > > > > > BTW, it seems the MountListener.java only can handle one device, > > > > > > right? > > > > > > Anyone have experience to handle above two MMC device viavold? > > > > > > > -- > > > > > > unsubscribe: [email protected] > > > > > > website:http://groups.google.com/group/android-porting > > > > > > > To unsubscribe, reply using "remove me" as the subject. -- unsubscribe: [email protected] website: http://groups.google.com/group/android-porting
