=> R0 = 11 (Read name and boot option)
R2 = buffer to write data to
R6 = pointer to special field, or 0 if not present (the PRMs are wrong)
This call should return the disc name for the disc containing the filing systems CSD, and its boot option. The data is to be written in this format.
Beware - the buffer pointed to will not have been validated with OS_ValidateAddress (as FileSwitch does not know how big it should be) - you should be preparaed to cope with faulting if writing to invalid memory. If the memory is invalid you should look up the error token 'BadWrt'.
It is unclear how the calling program is to find out how long the buffer should be, short of ensuring that it is at the top of memory so that overruns will cause memory errors.
FSEntry_Func 11 buffer format
Size Value Value if CSD unset
1 name length byte 5
n name (not terminated) "Unset"
1 boot option 0
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