137 lines
4.2 KiB
Plaintext
137 lines
4.2 KiB
Plaintext
|
|
||
|
|
U-Boot for Motorola M68K
|
||
|
|
|
||
|
|
Last Update: January 12, 2004
|
||
|
|
====================================================================
|
||
|
|
|
||
|
|
This file contains status information for the port of U-Boot to the
|
||
|
|
Motorola M68K series of CPUs.
|
||
|
|
|
||
|
|
1. OVERVIEW
|
||
|
|
-----------
|
||
|
|
Bernhard Kuhn ported U-Boot 0.4.0 to the Motorola Coldfire
|
||
|
|
architecture. The patches of Bernhard support the MCF5272 and
|
||
|
|
MCF5282. A great disadvantage of these patches was that they needed
|
||
|
|
a pre-bootloader to start u-boot. Because of this, a new port was
|
||
|
|
created which no longer needs a first stage booter.
|
||
|
|
|
||
|
|
Although this port is intended to cover all M68k processors, only
|
||
|
|
the parts for the Motorola Coldfire MCF5272 and MCF5282 are
|
||
|
|
implemented at the moment. Additional CPUs and boards will be
|
||
|
|
hopefully added soon!
|
||
|
|
|
||
|
|
|
||
|
|
2. SUPPORTED CPUs
|
||
|
|
-----------------
|
||
|
|
|
||
|
|
2.1 Motorola Coldfire MCF5272
|
||
|
|
-----------------------------
|
||
|
|
CPU specific code is located in: cpu/mcf52x2
|
||
|
|
|
||
|
|
|
||
|
|
2.1 Motorola Coldfire MCF5282
|
||
|
|
-----------------------------
|
||
|
|
CPU specific code is located in: cpu/mcf52x2
|
||
|
|
|
||
|
|
At the moment the code isn't fully implemented and still needs a pre-loader!
|
||
|
|
The preloader must initialize the processor and then start u-boot. The board
|
||
|
|
must be configured for a pre-loader (see 4.1)
|
||
|
|
|
||
|
|
For the preloader, please see
|
||
|
|
http://mailman.uclinux.org/pipermail/uclinux-dev/2003-December/023384.html
|
||
|
|
|
||
|
|
U-boot is configured to run at 0x20000 at default. This can be configured by
|
||
|
|
change TEXT_BASE in board/m5282evb/config.mk and CFG_MONITOR_BASE in
|
||
|
|
include/configs/M5282EVB.h.
|
||
|
|
|
||
|
|
|
||
|
|
3. SUPPORTED BOARDs
|
||
|
|
-------------------
|
||
|
|
|
||
|
|
3.1 Motorola M5272C3 EVB
|
||
|
|
------------------------
|
||
|
|
Board specific code is located in: board/m5272c3
|
||
|
|
|
||
|
|
To configure the board, type: make M5272C3_config
|
||
|
|
|
||
|
|
U-Boot Memory Map:
|
||
|
|
------------------
|
||
|
|
0xffe00000 - 0xffe3ffff u-boot
|
||
|
|
0xffe04000 - 0xffe05fff environment (embedded in u-boot!)
|
||
|
|
0xffe40000 - 0xffffffff free for linux/applications
|
||
|
|
|
||
|
|
|
||
|
|
3.2 Motorola M5282 EVB
|
||
|
|
------------------------
|
||
|
|
Board specific code is located in: board/m5282evb
|
||
|
|
|
||
|
|
To configure the board, type: make M5272C3_config
|
||
|
|
|
||
|
|
|
||
|
|
4. CONFIGURATION OPTIONS/SETTINGS
|
||
|
|
----------------------------------
|
||
|
|
|
||
|
|
4.1 Configuration to use a pre-loader
|
||
|
|
-------------------------------------
|
||
|
|
If u-boot should be loaded to RAM and started by a pre-loader
|
||
|
|
CONFIG_MONITOR_IS_IN_RAM must be defined. If it is defined the
|
||
|
|
initial vector table and basic processor initialization will not
|
||
|
|
be compiled in. The start address of u-boot must be adjusted in
|
||
|
|
the boards config header file (CFG_MONITOR_BASE) and Makefile
|
||
|
|
(TEXT_BASE) to the load address.
|
||
|
|
|
||
|
|
|
||
|
|
4.1 MCF5272 specific Options/Settings
|
||
|
|
-------------------------------------
|
||
|
|
|
||
|
|
CONFIG_MCF52x2 -- defined for all MCF52x2 CPUs
|
||
|
|
CONFIG_M5272 -- defined for all Motorola MCF5272 CPUs
|
||
|
|
|
||
|
|
CONFIG_MONITOR_IS_IN_RAM
|
||
|
|
-- defined if u-boot is loaded by a pre-loader
|
||
|
|
|
||
|
|
CFG_MBAR -- defines the base address of the MCF5272 configuration registers
|
||
|
|
CFG_INIT_RAM_ADDR
|
||
|
|
-- defines the base address of the MCF5272 internal SRAM
|
||
|
|
CFG_ENET_BD_BASE
|
||
|
|
-- defines the base addres of the FEC buffer descriptors
|
||
|
|
|
||
|
|
CFG_SCR -- defines the contents of the System Configuration Register
|
||
|
|
CFG_SPR -- defines the contents of the System Protection Register
|
||
|
|
CFG_BRx_PRELIM -- defines the contents of the Chip Select Base Registers
|
||
|
|
CFG_ORx_PRELIM -- defines the contents of the Chip Select Option Registers
|
||
|
|
|
||
|
|
CFG_PxDDR -- defines the contents of the Data Direction Registers
|
||
|
|
CFG_PxDAT -- defines the contents of the Data Registers
|
||
|
|
CFG_PXCNT -- defines the contents of the Port Configuration Registers
|
||
|
|
|
||
|
|
|
||
|
|
4.2 MCF5282 specific Options/Settings
|
||
|
|
-------------------------------------
|
||
|
|
|
||
|
|
CONFIG_MCF52x2 -- defined for all MCF52x2 CPUs
|
||
|
|
CONFIG_M5282 -- defined for all Motorola MCF5282 CPUs
|
||
|
|
|
||
|
|
CONFIG_MONITOR_IS_IN_RAM
|
||
|
|
-- defined if u-boot is loaded by a pre-loader
|
||
|
|
|
||
|
|
CFG_MBAR -- defines the base address of the MCF5282 internal register space
|
||
|
|
CFG_INIT_RAM_ADDR
|
||
|
|
-- defines the base address of the MCF5282 internal SRAM
|
||
|
|
CFG_INT_FLASH_BASE
|
||
|
|
-- defines the base address of the MCF5282 internal Flash memory
|
||
|
|
CFG_ENET_BD_BASE
|
||
|
|
-- defines the base addres of the FEC buffer descriptors
|
||
|
|
|
||
|
|
|
||
|
|
5. COMPILER
|
||
|
|
-----------
|
||
|
|
To create U-Boot the gcc-2.95.3 compiler set (m68k-elf-20030314) from uClinux.org was used.
|
||
|
|
You can download it from: http://www.uclinux.org/pub/uClinux/m68k-elf-tools/
|
||
|
|
|
||
|
|
|
||
|
|
Regards,
|
||
|
|
|
||
|
|
Josef
|
||
|
|
<josef.baumgartner@telex.de>
|