Overview — eCos Support for the TSEplus Hardware Design on a Cyclone II/2c35 Board
This package provides the hardware design HAL for the eCosPro TSEplus hardware design running on a Cyclone II/2c35 board. The design is based on the TSE_SGDMA design provided with the Altera Nios II Embedded Design Suite, with a number of extensions. It includes the following functionality:
- A Nios II/f processor running at 85MHz. This has 4K of instruction cache and 2K of data cache. It has level 2 jtag support with two hardware breakpoints. The reset vector is at address 0x00000000 in external flash and the exception vector is at address 0x04000020 in external SDRAM.
- 16MB of external AMD flash at 0x00000000 attached via an 8-bit data bus.
- 32MB of external SDRAM at 0x04000000.
- 2MB of external SRAM at 0x01200000.
- 8K of on-chip RAM at 0x01400000. Some of this will used by the triple speed ethernet device driver to store DMA descriptors.
- system clock
An Avalon timer labelled
sys_clkused to implement the main eCos system clock. This defaults to 100Hz but can be changed via the
CYGNUM_HAL_RTC_PERIODeCos configuration option.
- An Avalon uart connected to the external transceiver on the board. This is hardwired to 8 bits, no parity, and 1 stop bit. The default baud rate is 115200 but can be changed at run-time. The RTS and CTS signals are supported. This uart is used by eCos for the HAL diagnostics and debug channel.
- A triple speed ethernet tse_mac and associated rx_sgdma and tx_sgdma scatter-gather DMA controllers. This provides network communications for RedBoot and for eCos applications using one of the available TCP/IP stacks. Note that this device requires an external phy board to be plugged into one of the main board's expansion connectors.
- An interface to the external lan91c111 ethernet chip on the board. This can be used for network communication instead of the triple speed ethernet device, useful if the external phy board is not available.
- An Avalon timer set up to act as a watchdog device with a 10-second timeout.
- An additional Avalon timer used for gprof-based profiling.
- GPIO units connected to the row of LEDs, the dual seven-segment display, and the buttons. The devkit platform HAL provides some utility functions for the first two of these.
- A system id register. This is used by RedBoot to check that the current hardware design matches the RedBoot build.
- A number of other hardware units including a second Avalon timer, a jtag uart, a character LCD controller, and an EPCS serial flash controller. These are not currently used by eCos so can be accessed directly by application code.
The TSEplus hardware design HAL package is used with two different
eCos targets. The
target includes the TSE ethernet driver but not the lan91c111 ethernet
driver, and can be used when the external phy board is present. The
nios2_cyclone2_2c35_lan91c111 target includes
the lan91c111 ethernet driver but no the TSE ethernet driver and can
be used in the absence of the external phy board. When using a RAM
startup configuration the same eCos target should be used for both
RedBoot and the application.
The hardware design HAL package will be loaded automatically when creating an eCos configuration for either target, together with the Nios II architectural HAL and the devkit platform HAL. It should never be necessary to load this package explicitly. Unloading the package should only happen as a side effect of switching target hardware. The package does not contain any user configuration options.
The package contains a single configuration option,
CYGNUM_HAL_RTC_PERIOD. This determines the period
of the system clock. By default this operates at 100Hz but the value
can be changed if a faster or slower clock is desired. The value is
used to program the
PERIODL registers of the
sys_clk Avalon timer.
For typical eCos usage the memory map is as follows:
|0x00000000||16MB of flash|
|0x00000000||128K for RedBoot code|
|0x00800000||current hardware design|
|0x00c00000||factory hardware design|
|0x00FF0000||RedBoot fis and fconfig data|
|0x01200000||2MB of SRAM|
|0x01400000||8K of on-chip IRAM|
|0x01401E00||TSE DMA descriptors|
|0x04000000||32MB of SDRAM|
|0x04000100||~64K for RedBoot data|
|0x04010000||application code and data|
|2022-01-07||eCosPro Non-Commercial Public License|