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1. read_mii() now returns 0xffff on failure. It is more robust when it
comes to reading the reset bit in the control register, that is the
first access.
2. write_mii() now has error printout like read_mii().
3. Additional (optional) PHY access debugging is now available by
enabling GRETH_DEBUG_MII. Even successful accesses are printed.
4. Let PHY do power-down (not only reset) to get in a good state,
this is just in case the PHY input pin settings are sampled only
on PHY power-up on some PHYs.
5. PHY GBit advertisement is disabled if Gbit is not supported by MAC.
Or forced if supported.
6. Auto-nego is started if supported by PHY, before it was started only
if default set by PHY.
7. Reset Sequence updated:
* one must wait until reset bit is self-cleared.
* the DD (Disable Duplex Detection) bit is set, only affects
EDCL capable devices. This lets RTEMS handle PHY initialization
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Most drivers use the Driver Manager for device probing, they
work on AMBA-over-PCI systems if PCI is big-endian.
New APIs:
* GPIO Library, interfaced to GRGPIO
* GENIRQ, Generic interrupt service implementation helper
New GRLIB Drivers:
* ACTEL 1553 RT, user interface is similar to 1553 BRM driver
* GR1553 (1553 BC, RT and BM core)
* AHBSTAT (AHB error status core)
* GRADCDAC (Core interfacing to ADC/DAC hardware)
* GRGPIO (GPIO port accessed from GPIO Library)
* MCTRL (Memory controller settings configuration)
* GRETH (10/100/1000 Ethernet driver using Driver manager)
* GRPWM (Pulse Width Modulation core)
* SPICTRL (SPI master interface)
* GRSPW_ROUTER (SpaceWire Router AMBA configuration interface)
* GRCTM (SpaceCraft on-board Time Management core)
* SPWCUC (Time distribution over SpaceWire)
* GRTC (SpaceCraft up-link Tele core)
* GRTM (SpaceCraft down-link Tele Metry core)
GR712RC ASIC specific interfaces:
* GRASCS
* CANMUX (select between OCCAN and SATCAN)
* SATCAN
* SLINK
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