Noux application

[Joseph Lee]

Hi Christian,

Thank you for your explanation!

I just try "make run/sd_card" on imx53QSB using this branch (
https://github.com/m-stein/genode/commits/1497_usb_armory_demo)
<https://github.com/m-stein/genode/commits/1497_usb_armory_demo>

it displays the following log messages and hangs. It doesn't even start the
test application (test/test-blk-cli) included the run script. Is the
sd_card driver working? or what is missing?

kernel initialized
Genode 15.08
int main(): create local services
int main(): start init
int main(): transferred 248 MB to init
int main(): init created, waiting for exit condition

[init -> sd_card_drv] Could not open ROM session for module "config
[init -> sd_card_drv] Could not obtain config file
[init -> sd_card_drv] no VFS configured
[init -> sd_card_drv] --- Imx53 SD card driver ---

Thanks,


On Tue, Nov 3, 2015 at 8:39 AM, Christian Helmuth <
christian.helmuth at ...1...> wrote:

> Hello Joseph,
>
> On Tue, Nov 03, 2015 at 01:31:55AM +0100, Joseph Lee wrote:
> > I have one more question. i know that ram__fs file system creates a
> storage
> > area in RAM and will continue using it util the system runs out of RAM.
> So
> > when i put a large file in the file system it says out of memory. Could
> you
> > please tell me maybe if there is a way to store a large file into sdcard
> > partition?
>
> First, the RAM quota that may be used by the ram_fs can be configured
> in the init <start> node with the sub node
>
>   <resource name="RAM" quantum="..."/>
>
> but you're right: The file size is limited by the amount of available
> RAM of the platform, which is not that much on the i.MX53 QSB.
>
> If you target to use an SD card as storage media you'll need a stack
> of components (bottom-up)
>
> - A driver for the SD card controller and the actual SD card
>   (protocol). We are busy to stabilize our implementation for i.MX53
>   currently on the following branch
>
>     https://github.com/m-stein/genode/commits/1497_usb_armory_demo
>
>   but you may give the "make run/sd_card" scenario a try. Please make
>   sure to use a separate SD card for such testing to not corrupt your
>   master card. The SD-card driver provides a Block session to access
>   the contents of the actual card.
>
> - Optionally, you may need a partition-table driver if your card is
>   partitioned, which will be the case if the card is also your boot
>   device. Our implementation is part_blk which supports MSDOS as well
>   as GPT partition tables and provides a Block session for each
>   partition found on the Block session used by the driver.
>
> - Next, you'll need a file-system implementation, which uses the Block
>   session and provides a file-based API. Our implementation for FAT
>   uses the ffat library. Please have a look at
>
>     repos/libports/run/libc_ffat.run.
>
>   Depending on the use case the file-system library is directly linked
>   to the application or into a File_system server in Genode 15.08. We
>   have still some loose ends here that we're busy to tie up. In the
>   upcoming Genode 15.11, we strive to consolidate all file-system
>   related functionality into the VFS, which renders the use of a
>   file-system server vs. a local plugin instance just a matter of
>   configuration.
>
> To sum it up from the background of your use case I have no ready to
> use configuration you may just reuse. Therefore, I suggest you walk on
> step by step and ask specific questions if issues occur. One side note
> from me: If you could imagine to use ext2 on a second partition of
> your SD card, you may use the rump_fs server like in
>
>   repos/dde_rump/run/rump_ext2.run
>
> which also illustrates how to configure your libc application with a
> mount point for the file system.
>
> Regards
> --
> Christian Helmuth
> Genode Labs
>
> http://www.genode-labs.com/ · http://genode.org/
> https://twitter.com/GenodeLabs · /ˈdʒiː.nəʊd/
>
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