Simon Glass <sjg@chromium.org>
(See sandbox_blk for operation)
Sandbox block devices are implemented using the UCLASS_HOST uclass. Only one driver is provided (host_sb_drv) so all devices in the uclass use the same driver.
The uclass has a simple API allowing files to be attached and detached. Attaching a file results in it appearing as a block device in sandbox. This allows filesystems and whole disk images to be accessed from U-Boot. This is particularly useful for tests.
Devices are created using host_create_device(). This sets up a new UCLASS_HOST.
The device can then be attached to a file with host_attach_file(). This creates the child block device (and bootdev device).
The host device's block device must be probed before use, as normal.
To destroy a device, call host_destroy_device(). This removes the device (and its children of course), then closes any attached file, then unbinds the device.
There is no arbitrary limit to the number of host devices that can be created.
This is incomplete as it isn't clear how to make Sphinx do the right thing for struct host_ops. See include/sandbox_host.h for full details.
include/sandbox_host.h