fatfs: Fix unaligned access in disk_ioctl

[geky]

Unlike the other disk_ioctl options, GET_SECTOR_SIZE is interpreted as a 16-bit WORD, instead of a 32-bit DWORD. This caused an unaligned access error on M0 platforms.

disk_ioctl documentation:
http://elm-chan.org/fsw/ff/doc/dioctl.html

related issue #4649
cc @LMESTM

[LMESTM]

Using a 16 bits size instead of 32 bits is another fix I had tried and I confirm this works fine !

[0xc0170]

/morph test-nightly

[mbed-bot]

Result: FAILURE

Your command has finished executing! Here's what you wrote!

/morph test-nightly

Output

mbed Build Number: 676

Test failed!

[geky]

Looks like a timing failure in tests-mbed_drivers-wait_us?

14:27:57 [1498678112.35][HTST][INF] tick! 1498678112.326000
14:27:57 [1498678112.35][HTST][INF] tick! 1498678112.326000
14:27:57 [1498678112.35][HTST][INF] Received end event, timestamp: 1498678112.326000
14:27:57 [1498678112.35][HTST][INF] Start: 1498678100.974000
14:27:57 [1498678112.35][HTST][INF] Finish: 1498678112.326000
14:27:57 [1498678112.35][HTST][INF] Total time taken: 11.352000
14:27:57 [1498678112.35][HTST][INF] Total drift/Max total drift: 1.352000/0.500000
14:27:57 [1498678112.35][HTST][INF] Average drift/Max average drift: 0.135200/0.050000
14:27:57 [1498678112.35][HTST][INF] FAIL: Total drift exceeded max total drift

[chrissnow]

@geky might be unrelated but I've just been facing similar test timing issues here 4640
Edit: yes it was unrelated. I misread something..

[theotherjimmy]

/morph test-nightly

[mbed-bot]

Result: FAILURE

Your command has finished executing! Here's what you wrote!

/morph test-nightly

Output

mbed Build Number: 698

Test failed!

[0xc0170]

Hold on with nightly until we got #4672 on master

[theotherjimmy]

#4672 on master. /morph test-nightly

[mbed-bot]

Result: FAILURE

Your command has finished executing! Here's what you wrote!

/morph test-nightly

Output

mbed Build Number: 747

Test failed!

[0xc0170]

/morph test-nightly

[mbed-bot]

Result: SUCCESS

Your command has finished executing! Here's what you wrote!

/morph test-nightly

Output

mbed Build Number: 757

All builds and test passed!