Glossary of common terms¶

RCW (Reset Configuration Word)¶

This is a set bytes that is read by the LS1088 CPU at startup, to configure clocks, active hardware blocks and pin multiplexing options. You can see a read out from u-boot:

Reset Configuration Word (RCW):
       00000000: 4000541c 00000040 00000000 00000000
       00000010: 00000000 000a0000 00300000 00000000
       00000020: 010011a0 00002580 00000000 00000000
       00000030: 013fe60b 00000000 00002c03 00000000
       00000040: 00000000 00000000 00000000 00000000
       00000050: 00000000 00000000 00000000 00000000
       00000060: 00000000 00000000 00000089 000009e7
       00000070: 44110000 0d007755

A set of pins denoted cfg_rcw_src[0:8] decide which media the CPU reads the RCW from - the board microcontroller will drive these pins for the desired boot option (QSPI or SD)

Management Complex¶

Management Complex provides management services for the DPAA2 resources. It provides a 'bus' style interface to expose resources under it (such as DPNI's and DPIO's), as well as a firmware interface to receive commands from the operating system.

DPNI¶

Data Path Network Interface - the DPAA2 object corresponding to a network interface.

DPMAC¶

Data Path MAC - the DPAA2 object corresponding to an Ethernet MAC.

Typically, DPMAC and DPNI are wired together.

DPIO,DPCON,DPBP,DPRC, DPMCP and other DPAA2 objects¶

see DPAA2 overview

QSPI¶

Quad SPI - an enhanced SPI (Serial Peripheral Interface) that improves bandwidth by using more lanes for transfer. The boot flash memory devices are connected to the SoC with QSPI.

BL1/2/3¶

Stages in the Trusted Firmware boot loader, BL1 is the initial code executed by the processor after reset, BL2 loads and authenticates further images such as BL31/BL32/BL33.

See the Trusted Firmware documentation for more details.