eCosPro® Reference Manual
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# The HAL Port

## Name

HAL Port -- Implementation Details

## Overview

This documentation explains how the eCos HAL specification has been mapped onto the IQ80321 hardware, and should be read in conjunction with that specification. The IQ80321 platform HAL package complements the ARM architectural HAL, the XScale core HAL and the IOP321 (VERDE) variant HAL. It provides functionality which is specific to the target board.

## Startup

Following a hard or soft reset the HAL will initialize or reinitialize the on-chip peripherals that are used by eCos. There is an exception for RAM startup applications which depend on a ROM monitor for certain services.

For ROM startup, the HAL will perform additional initialization, setting up the external SDRAM and programming the various internal registers. This is all done in the `PLATFORM_SETUP1` macro in the assembler header file `hal_platform_setup.h`.

## Memory Maps

The RAM based page table is located at RAM start + 0x4000.

> NOTE: The virtual memory map in this section uses a C, B, and X column to indicate the caching policy for the region.

    X C B  Description
    - - -  ---------------------------------------------
    0 0 0  Uncached/Unbuffered
    0 0 1  Uncached/Buffered
    0 1 0  Cached/Buffered    Write Through, Read Allocate
    0 1 1  Cached/Buffered    Write Back, Read Allocate
    1 0 0  Invalid -- not used
    1 0 1  Uncached/Buffered  No write buffer coalescing
    1 1 0  Mini DCache - Policy set by Aux Ctl Register
    1 1 1  Cached/Buffered    Write Back, Read/Write Allocate

    Physical Address Range     Description
    -----------------------    ----------------------------------
    0x00000000 - 0x7fffffff    ATU Outbound Direct Window
    0x80000000 - 0x900fffff    ATU Outbound Translate Windows
    0xa0000000 - 0xbfffffff    SDRAM
    0xf0000000 - 0xf0800000    FLASH               (PBIU CS0)
    0xfe800000 - 0xfe800fff    UART                (PBIU CS1)
    0xfe840000 - 0xfe840fff    Left 7-segment LED  (PBIU CS3)
    0xfe850000 - 0xfe850fff    Right 7-segment LED (PBIU CS2)
    0xfe8d0000 - 0xfe8d0fff    Rotary Switch       (PBIU CS4)
    0xfe8f0000 - 0xfe8f0fff    Battery Status      (PBIU CS5)
    0xfff00000 - 0xffffffff    Verde Memory mapped Registers

    Default Virtual Map      X C B  Description
    -----------------------  - - -  ----------------------------------
    0x00000000 - 0x1fffffff  1 1 1  SDRAM
    0x20000000 - 0x9fffffff  0 0 0  ATU Outbound Direct Window
    0xa0000000 - 0xb00fffff  0 0 0  ATU Outbound Translate Windows
    0xc0000000 - 0xdfffffff  0 0 0  Uncached alias for SDRAM
    0xe0000000 - 0xe00fffff  1 1 1  Cache flush region (no phys mem)
    0xf0000000 - 0xf0800000  0 1 0  FLASH               (PBIU CS0)
    0xfe800000 - 0xfe800fff  0 0 0  UART                (PBIU CS1)
    0xfe840000 - 0xfe840fff  0 0 0  Left 7-segment LED  (PBIU CS3)
    0xfe850000 - 0xfe850fff  0 0 0  Right 7-segment LED (PBIU CS2)
    0xfe8d0000 - 0xfe8d0fff  0 0 0  Rotary Switch       (PBIU CS4)
    0xfe8f0000 - 0xfe8f0fff  0 0 0  Battery Status      (PBIU CS5)
    0xfff00000 - 0xffffffff  0 0 0  Verde Memory mapped Registers

## Other Issues

The IQ80321 platform HAL does not affect the implementation of other parts of the eCos HAL specification. The XScale core HAL, the IOP321 (VERDE) variant HAL, and the ARM architectural HAL documentation should be consulted for further details.

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