Writing to absolute sectors on SD Card

[sebastian.huber at embedded-brains.de (Sebastian Huber)]

Chris Johns wrote:
> Robert S. Grimes wrote:
>> Is it possible to write to absolute sectors using the spi-sd-card driver?
> 
> Yes but you are on your own with how this interacts with the cache. I wonder 
> why the SD card is implemented this way. I would have thought the 
> rtems_blkdev_generic_* calls such as rtems_blkdev_generic_write was the way to 
> do this. This removes the need for sd_card_driver_read and 
> sd_card_driver_write. Maybe Thomas could help here.

I used the sd_card_driver_* stuff for testing and debugging.  Maybe it
is better to remove it and provide only the LibBlock interface.  Can I
just add these rtems_blkdev_generic_* functions to the sd_card_disk_ops
and only provide a custom initialization function?

[...]

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