eCos Support for the Ashling EVBA7 Eval Board — Overview
The Ashling EVBA7 Eval Board is fitted with a Philips LPC2000 processor rated to 60MHz, which contains up to 64KB of SRAM and up to 256KB of FLASH. The board has two 9-pin RS-232 serial interfaces connected to the LPC2000 on-chip UARTs, an LED bank and JTAG/USB debug interfaces. Refer to the board documentation for full details.
The standard EVBA7 is fitted with an LPC2106 microcontroller. Some versions of the EVBA7 board are fitted with an adaptor that either contains a specific LPC2000 part, or a socket into which one of several LPC2000 parts may be fitted.
For typical eCos development, a RedBoot or GDB Stubrom image is programmed into the LPC2000 on-chip flash memory, and the board will boot this image from reset. Both RedBoot and the GDB stub ROM provide GDB stub functionality so it is then possible to download and debug stand-alone and eCos applications via the gdb debugger using UART 0.
This documentation describes platform-specific elements of the EVBA7 Eval Board support within eCos. Documentation on the Philips LPC2xxx variants is available separately, and should be read in conjunction with this documentation. The LPC2xxx documentation covers various topics including HAL support common to LPC2xxx variants, and on-chip device support. This document complements the LPC2xxx documentation.
The EVBA7 Eval Board has up to 128Kbyte of on-chip Flash memory. In a typical setup, RedBoot or the GDB Stubrom will load and run from this internal flash. No support for managing internal Flash is included in this port - the Ashling FlashLPC Utility is required to program the internal Flash. 24Kbytes of internal flash memory should be reserved for the GDB Stubrom, the remainder being free for the application's use. RedBoot will occupy the entire internal ROM.
EVBA7 boards fitted with the PA-EVBA7-144 adaptor also have 1MByte of external RAM on the adaptor. In this case, eCos is configured to use this memory rather than the internal SRAM. These are also the only boards capable of running RedBoot.
The first 64 bytes of on-chip SRAM are mapped by the HAL startup code using the LPC2000 memory mapping control to location 0x00000000 for speed of interrupt vector processing. SRAM from location 0x40000040 to 0x40001000 is used by the GDB Stubrom. The rest of SRAM is available for use by the application.
The Philips LPC2xxx variant HAL includes support for the two LPC2000 on-chip serial devices and is documented in the variant HAL. The interrupt-driven serial driver supports the line status and modem control (including hardware handshaking) lines on UART1 only.
The EVBA7 Eval Board port includes support for the on-chip watchdog, RTC (wallclock), and interrupt controller (VIC). This support is documented in the LPC2xxx variant HAL.
The EVBA7 Eval Board port is intended to work with GNU tools configured for an arm-eabi target. Thumb mode is supported. The original port was done using arm-elf-gcc version 3.3.3, arm-elf-gdb version 6.1, and binutils version 2.14.
|2021-09-02||eCosPro Non-Commercial Public License|