projects / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| bf9e3b38 WD |
1 | |
| 2 | U-Boot for Motorola M68K | |
| 3 | ||
| 4 | Last Update: January 12, 2004 | |
| 5 | ==================================================================== | |
| 6 | ||
| 7 | This file contains status information for the port of U-Boot to the | |
| 8 | Motorola M68K series of CPUs. | |
| 9 | ||
| 10 | 1. OVERVIEW | |
| 11 | ----------- | |
| 12 | Bernhard Kuhn ported U-Boot 0.4.0 to the Motorola Coldfire | |
| 13 | architecture. The patches of Bernhard support the MCF5272 and | |
| 14 | MCF5282. A great disadvantage of these patches was that they needed | |
| 15 | a pre-bootloader to start u-boot. Because of this, a new port was | |
| 16 | created which no longer needs a first stage booter. | |
| 17 | ||
| 18 | Although this port is intended to cover all M68k processors, only | |
| 19 | the parts for the Motorola Coldfire MCF5272 and MCF5282 are | |
| 20 | implemented at the moment. Additional CPUs and boards will be | |
| 21 | hopefully added soon! | |
| 22 | ||
| 23 | ||
| 24 | 2. SUPPORTED CPUs | |
| 25 | ----------------- | |
| 26 | ||
| 27 | 2.1 Motorola Coldfire MCF5272 | |
| 28 | ----------------------------- | |
| 29 | CPU specific code is located in: cpu/mcf52x2 | |
| 30 | ||
| 31 | ||
| 32 | 2.1 Motorola Coldfire MCF5282 | |
| 33 | ----------------------------- | |
| 34 | CPU specific code is located in: cpu/mcf52x2 | |
| 35 | ||
| 36 | At the moment the code isn't fully implemented and still needs a pre-loader! | |
| 37 | The preloader must initialize the processor and then start u-boot. The board | |
| 38 | must be configured for a pre-loader (see 4.1) | |
| 39 | ||
| cfca5e60 WD |
40 | For the preloader, please see |
| 41 | http://mailman.uclinux.org/pipermail/uclinux-dev/2003-December/023384.html | |
| 42 | ||
| bf9e3b38 WD |
43 | U-boot is configured to run at 0x20000 at default. This can be configured by |
| 44 | change TEXT_BASE in board/m5282evb/config.mk and CFG_MONITOR_BASE in | |
| 45 | include/configs/M5282EVB.h. | |
| 46 | ||
| 47 | ||
| 48 | 3. SUPPORTED BOARDs | |
| 49 | ------------------- | |
| 50 | ||
| 51 | 3.1 Motorola M5272C3 EVB | |
| 52 | ------------------------ | |
| 53 | Board specific code is located in: board/m5272c3 | |
| 54 | ||
| 55 | To configure the board, type: make M5272C3_config | |
| 56 | ||
| 57 | U-Boot Memory Map: | |
| 58 | ------------------ | |
| 59 | 0xffe00000 - 0xffe3ffff u-boot | |
| 60 | 0xffe04000 - 0xffe05fff environment (embedded in u-boot!) | |
| 61 | 0xffe40000 - 0xffffffff free for linux/applications | |
| 62 | ||
| 63 | ||
| 64 | 3.2 Motorola M5282 EVB | |
| 65 | ------------------------ | |
| 66 | Board specific code is located in: board/m5282evb | |
| 67 | ||
| 68 | To configure the board, type: make M5272C3_config | |
| 69 | ||
| 70 | ||
| 71 | 4. CONFIGURATION OPTIONS/SETTINGS | |
| 72 | ---------------------------------- | |
| 73 | ||
| 74 | 4.1 Configuration to use a pre-loader | |
| 75 | ------------------------------------- | |
| 76 | If u-boot should be loaded to RAM and started by a pre-loader | |
| 77 | CONFIG_MONITOR_IS_IN_RAM must be defined. If it is defined the | |
| 78 | initial vector table and basic processor initialization will not | |
| 79 | be compiled in. The start address of u-boot must be adjusted in | |
| 80 | the boards config header file (CFG_MONITOR_BASE) and Makefile | |
| 81 | (TEXT_BASE) to the load address. | |
| 82 | ||
| 83 | ||
| 84 | 4.1 MCF5272 specific Options/Settings | |
| 85 | ------------------------------------- | |
| 86 | ||
| 87 | CONFIG_MCF52x2 -- defined for all MCF52x2 CPUs | |
| 88 | CONFIG_M5272 -- defined for all Motorola MCF5272 CPUs | |
| 89 | ||
| 90 | CONFIG_MONITOR_IS_IN_RAM | |
| 91 | -- defined if u-boot is loaded by a pre-loader | |
| 92 | ||
| 93 | CFG_MBAR -- defines the base address of the MCF5272 configuration registers | |
| 94 | CFG_INIT_RAM_ADDR | |
| 95 | -- defines the base address of the MCF5272 internal SRAM | |
| 96 | CFG_ENET_BD_BASE | |
| 97 | -- defines the base addres of the FEC buffer descriptors | |
| 98 | ||
| 99 | CFG_SCR -- defines the contents of the System Configuration Register | |
| 100 | CFG_SPR -- defines the contents of the System Protection Register | |
| 101 | CFG_BRx_PRELIM -- defines the contents of the Chip Select Base Registers | |
| 102 | CFG_ORx_PRELIM -- defines the contents of the Chip Select Option Registers | |
| 103 | ||
| 104 | CFG_PxDDR -- defines the contents of the Data Direction Registers | |
| 105 | CFG_PxDAT -- defines the contents of the Data Registers | |
| 106 | CFG_PXCNT -- defines the contents of the Port Configuration Registers | |
| 107 | ||
| 108 | ||
| 109 | 4.2 MCF5282 specific Options/Settings | |
| 110 | ------------------------------------- | |
| 111 | ||
| 112 | CONFIG_MCF52x2 -- defined for all MCF52x2 CPUs | |
| 113 | CONFIG_M5282 -- defined for all Motorola MCF5282 CPUs | |
| 114 | ||
| 115 | CONFIG_MONITOR_IS_IN_RAM | |
| 116 | -- defined if u-boot is loaded by a pre-loader | |
| 117 | ||
| 118 | CFG_MBAR -- defines the base address of the MCF5282 internal register space | |
| 119 | CFG_INIT_RAM_ADDR | |
| 120 | -- defines the base address of the MCF5282 internal SRAM | |
| 121 | CFG_INT_FLASH_BASE | |
| 122 | -- defines the base address of the MCF5282 internal Flash memory | |
| 123 | CFG_ENET_BD_BASE | |
| 124 | -- defines the base addres of the FEC buffer descriptors | |
| 125 | ||
| 126 | ||
| 127 | 5. COMPILER | |
| 128 | ----------- | |
| 129 | To create U-Boot the gcc-2.95.3 compiler set (m68k-elf-20030314) from uClinux.org was used. | |
| 130 | You can download it from: http://www.uclinux.org/pub/uClinux/m68k-elf-tools/ | |
| 131 | ||
| 132 | ||
| 133 | Regards, | |
| 134 | ||
| 135 | Josef | |
| 136 | <[email protected]> |