RPi SD card Driver

[Mudit Jain]

Hi all,

Good News !!

I have successfully moved my changes on top of the recent MMC stack update
to use the FreeBSD trunk, 2016-08-23,
9fe7c416e6abb28b1398fd3e5687099846800cfd

The GitHub Link :
https://github.com/spark1729/rtems-libbsd/commits/RPI_SD_LIBBSD

Sebastian, if you can review the commits, then I will push it as patches.

Testing :
As shown below, the DMA controller, SDHCI controller, MMC bus and the MMCSD
are initialized and the card is identified correctly.

*** LIBBSD SDHCI 01 TEST ***
nexus0: <RTEMS Nexus device>
bcm_dma0: <BCM2835 DMA Controller> on nexus0
sdhci_bcm0: <Broadcom 2708 SDHCI controller> on nexus0
mmc0: <MMC/SD bus> on sdhci_bcm0
mmcsd0: 8GB <SDHC SL08G 8.0 SN ED120D81 MFG 11/2015 by 3 SD> at mmc0
50.0MHz/4bit/65535-block
Sleeping to see what happens
Stack usage by thread
    ID      NAME    LOW          HIGH     CURRENT     AVAILABLE     USED
0x09010001  IDLE 0x12cc10 - 0x12dc0f 0x12dba8      4080        128
0x0a010001  UI1  0x12de28 - 0x135e27 0x135a50     32752       1472
0x0a010002  TIME 0x136578 - 0x13e577 0x13e4b8     32752        332
0x0a010003  IRQS 0x13e580 - 0x14657f 0x1464c0     32752        308
0x0a010004  _BSD 0x158bb0 - 0x160baf 0x160ae8     32752        344
0x0a010005  _BSD 0x160d00 - 0x168cff 0x168c38     32752        240
0x0a010006  _BSD 0x16aed0 - 0x172ecf 0x172e10     32752        232
0x0a010007  _BSD 0x172f90 - 0x17af8f 0x17aed0     32752        232
0x0a010008  _BSD 0x17b128 - 0x183127 0x183060     32752        240
0x0a010009  _BSD 0x1832c0 - 0x18b2bf 0x18b1f8     32752        240
*** END OF TEST LIBBSD SDHCI 01 ***

Thanks
Mudit
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