2 U-Boot for Motorola M68K
4 ====================================================================
7 August 08,2005; Jens Scharsig <esw@bus-elektronik.de>
8 MCF5282 implementation without preloader
9 January 12, 2004; <josef.baumgartner@telex.de>
10 ====================================================================
12 This file contains status information for the port of U-Boot to the
13 Motorola M68K series of CPUs.
17 Bernhard Kuhn ported U-Boot 0.4.0 to the Motorola Coldfire
18 architecture. The patches of Bernhard support the MCF5272 and
19 MCF5282. A great disadvantage of these patches was that they needed
20 a pre-bootloader to start u-boot. Because of this, a new port was
21 created which no longer needs a first stage booter.
23 Although this port is intended to cover all M68k processors, only
24 the parts for the Motorola Coldfire MCF5272 and MCF5282 are
25 implemented at the moment. Additional CPUs and boards will be
32 2.1 Motorola Coldfire MCF5272
33 -----------------------------
34 CPU specific code is located in: cpu/mcf52x2
37 2.1 Motorola Coldfire MCF5282
38 -----------------------------
39 CPU specific code is located in: cpu/mcf52x2
41 The MCF5282 Port no longer needs a preloader and can place in external or
48 3.1 Motorola M5272C3 EVB
49 ------------------------
50 Board specific code is located in: board/m5272c3
52 To configure the board, type: make M5272C3_config
56 0xffe00000 - 0xffe3ffff u-boot
57 0xffe04000 - 0xffe05fff environment (embedded in u-boot!)
58 0xffe40000 - 0xffffffff free for linux/applications
61 3.2 Motorola M5282 EVB
62 ------------------------
63 Board specific code is located in: board/m5282evb
65 To configure the board, type: make M5272C3_config
67 At the moment the code isn't fully implemented and still needs a pre-loader!
68 The preloader must initialize the processor and then start u-boot. The board
69 must be configured for a pre-loader (see 4.1)
71 For the preloader, please see
72 http://mailman.uclinux.org/pipermail/uclinux-dev/2003-December/023384.html
74 U-boot is configured to run at 0x20000 at default. This can be configured by
75 change TEXT_BASE in board/m5282evb/config.mk and CFG_MONITOR_BASE in
76 include/configs/M5282EVB.h.
81 Board specific code is located in: board/bus/EB+MCF-EV123
83 To configure the board, type:
85 make EB+MCF-EV123_config for external FLASH
86 make EB+MCF-EV123_internal_config for internal FLASH
89 4. CONFIGURATION OPTIONS/SETTINGS
90 ----------------------------------
92 4.1 Configuration to use a pre-loader
93 -------------------------------------
94 If u-boot should be loaded to RAM and started by a pre-loader
95 CONFIG_MONITOR_IS_IN_RAM must be defined. If it is defined the
96 initial vector table and basic processor initialization will not
97 be compiled in. The start address of u-boot must be adjusted in
98 the boards config header file (CFG_MONITOR_BASE) and Makefile
99 (TEXT_BASE) to the load address.
101 4.1 MCF5272 specific Options/Settings
102 -------------------------------------
104 CONFIG_MCF52x2 -- defined for all MCF52x2 CPUs
105 CONFIG_M5272 -- defined for all Motorola MCF5272 CPUs
107 CONFIG_MONITOR_IS_IN_RAM
108 -- defined if u-boot is loaded by a pre-loader
110 CFG_MBAR -- defines the base address of the MCF5272 configuration registers
112 -- defines the base address of the MCF5272 internal SRAM
114 -- defines the base addres of the FEC buffer descriptors
116 CFG_SCR -- defines the contents of the System Configuration Register
117 CFG_SPR -- defines the contents of the System Protection Register
118 CFG_BRx_PRELIM -- defines the contents of the Chip Select Base Registers
119 CFG_ORx_PRELIM -- defines the contents of the Chip Select Option Registers
121 CFG_PxDDR -- defines the contents of the Data Direction Registers
122 CFG_PxDAT -- defines the contents of the Data Registers
123 CFG_PXCNT -- defines the contents of the Port Configuration Registers
126 4.2 MCF5282 specific Options/Settings
127 -------------------------------------
129 CONFIG_MCF52x2 -- defined for all MCF52x2 CPUs
130 CONFIG_M5282 -- defined for all Motorola MCF5282 CPUs
132 CONFIG_MONITOR_IS_IN_RAM
133 -- defined if u-boot is loaded by a pre-loader
135 CFG_MBAR -- defines the base address of the MCF5282 internal register space
137 -- defines the base address of the MCF5282 internal SRAM
139 -- defines the base address of the MCF5282 internal Flash memory
141 -- defines the base addres of the FEC buffer descriptors
144 -- defines the PLL Multiplication Factor Devider
145 (see table 9-4 of MCF user manual)
146 CFG_RFD -- defines the PLL Reduce Frecuency Devider
147 (see table 9-4 of MCF user manual)
149 CFG_CSx_BASE -- defines the base address of chip select x
150 CFG_CSx_SIZE -- defines the memory size (address range) of chip select x
151 CFG_CSx_WIDTH -- defines the bus with of chip select x
152 CFG_CSx_RO -- if set to 0 chip select x is read/wirte
153 else chipselct is read only
154 CFG_CSx_WS -- defines the number of wait states of chip select x
156 CFG_PxDDR -- defines the contents of the Data Direction Registers
157 CFG_PxDAT -- defines the contents of the Data Registers
158 CFG_PXCNT -- defines the contents of the Port Configuration Registers
160 CFG_PxPAR -- defines the function of ports
165 To create U-Boot the gcc-2.95.3 compiler set (m68k-elf-20030314) from uClinux.org was used.
166 You can download it from: http://www.uclinux.org/pub/uClinux/m68k-elf-tools/