• http://www.voipac.com/
• Marvell PXA270 and ARM Microprocessor Tips

make menuconfig

Target Architecture (arm)
Target Architecture Variant (xscale)
Target ABI (OABI)
System configuration
  (em5) System hostname
  (ttyS0) Port to run a getty (login prompt) on 
  Baudrate to use (38400)
Kernel  
  Kernel binary format (zImage)  ---> 

make uclibc-menuconfig

Target Architecture Features and Options
  [*]   Target CPU has a floating point unit (FPU)
Networking Support
  [*]     Remote Procedure Call (RPC) support

• 32 DMA channels, DMA[31:0]
• supports flow-through and fly-by transfer
• 32 channels, 68 PBP (peripherial-bus peripherals) requests, 3 IBP (internal-bus peripherals, only quick-capture interface in this chip) requests, and 3 external device requests.

A companion chip is defined as a device that has the ability to control the external bus, whereas an external peripheral must be controlled by the memory controller.

For a flow-through DMA read/write from/to an internal peripheral, use the following settings for the DMA controller register bits:

Read:
DCMDx[FLYBYS] and DCMDx[FLYBYT] = 0
DSADRx[SRCADDR] = memory address
DTADRx[TRGADDR] = internal peripheral address
DCMDx[INCSRCADDR] = 1
DCMDx[INCTRGADDR] = 0
DCMDx[FLOWSRC] = 0
DCMDx[FLOWTRG] = 1

Write:
DCMDx[FLYBYS] and DCMDx[FLYBYT] = 0
DSADRx[SRCADDR] = internal peripheral address
DTADRx[TRGADDR] = memory address
DCMDx[INCSRCADDR] = 0
DCMDx[INCTRGADDR] = 1
DCMDx[FLOWSRC] = 1
DCMDx[FLOWTRG] = 0