diff options
Diffstat (limited to 'board/icecube')
| -rw-r--r-- | board/icecube/README | 13 | ||||
| -rw-r--r-- | board/icecube/README.Lite5200B_low_power | 22 |
2 files changed, 35 insertions, 0 deletions
diff --git a/board/icecube/README b/board/icecube/README new file mode 100644 index 0000000..5252bc9 --- /dev/null +++ b/board/icecube/README @@ -0,0 +1,13 @@ +--------------------------------------------------------------------------- +Build target Flash address | BDI "go" command | Reset Vector +--------------------------------------------------------------------------- +Lite5200 0xFFF00000 | 0xFFF00100 | 0xFFF00100 +Lite5200_LOWBOOT 0xFF000000 | 0xFF000100 | 0x00000100 +Lite5200_LOWBOOT08 0xFF800000 | 0xFF800100 | 0x00000100 +icecube_5200 0xFFF00000 | 0xFFF00100 | 0xFFF00100 +icecube_5200_LOWBOOT 0xFF000000 | 0xFF000100 | 0x00000100 +icecube_5200_LOWBOOT08 0xFF800000 | 0xFF800100 | 0x00000100 +icecube_5200_DDR 0xFFF00000 | 0xFFF00100 | 0xFFF00100 +icecube_5200_DDR_LOWBOOT 0xFF800000 | 0xFF800100 | 0x00000100 +icecube_5200_DDR_LOWBOOT08 0xFF800000 | 0xFF800100 | 0x00000100 +--------------------------------------------------------------------------- diff --git a/board/icecube/README.Lite5200B_low_power b/board/icecube/README.Lite5200B_low_power new file mode 100644 index 0000000..5b04fbb --- /dev/null +++ b/board/icecube/README.Lite5200B_low_power @@ -0,0 +1,22 @@ +Lite5200B wakeup from low-power mode (CONFIG_LITE5200B_PM) +---------------------------------------------------------- + +Low-power mode as described in Lite5200B User's Manual, means that +with support of MC68HLC908QT1 microcontroller (refered to as QT), +everything but the SDRAM can be powered down. This brings +maximum power saving, while one can still restore previous state +quickly. + +Quick overview where U-Boot comes into the picture: +- OS saves device states +- OS saves wakeup handler address to physical 0x0, puts SDRAM into + self-refresh and signals to QT, it should power down the board +- / board is sleeping here / +- someone presses SW4 (connected to QT) +- U-Boot checks PSC2_4 pin, if QT drives it down, then we woke up, + so get SDRAM out of self-refresh and transfer control to OS + wakeup handler +- OS restores device states + +This was tested on Linux with USB and Ethernet in use. Adding +support for other devices is an OS issue. |