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wdenka562e1b2005-01-09 18:21:42 +00001File: README.COBRA5272
2Author: Florian Schlote for Sentec elektronik (linux@sentec-elektronik.de)
3Contents: This is the README of u-boot (Universal bootloader) for our
4 COBRA5272 board.
5Version: v01.00
6Date: Tue Mar 30 00:28:33 CEST 2004
7License: This document is published under the GNU GPL
8______________________________________________________________________
9
10CHANGES
11040330 v01.00 Creation
12
13______________________________________________________________________
14
15
16CONFIGURING
17-----------
18
191. Modify include/configs/cobra5272.h acc. to your prefs
20
212. If necessary, modify board/cobra5272/config.mk (see below)
22
233.
24
25> make cobra5272_config
26
27> make
28
29
30Please refer to u-boot README (general info, u-boot-x-x-x/README),
31to u-boot-x-x-x/doc/README.COBRA5272 and
32to the comments in u-boot-x-x-x/include/configs/cobra5272.h
33
34Configuring u-boot is done by commenting/uncommenting preprocessor defines.
35
36Default configuration is
37
38 FLASH version (for further info see subsection below)
39 link address 0xffe00000
40
41 16 MB RAM
42
43 network enabled
44 no default IP address for target, host set, no MACaddress set
45
46 bootdelay for autoboot 5 sec.
47 autoboot disabled
48
49
50#-----------------------------------
51# u-boot FLASH version & RAM version
52#-----------------------------------
53
54The u-boot bootloader for Coldfire processors can be configured
55
56 1. as a standalone bootloader residing in flash & relocating itself to RAM on
57 startup automatically => "FLASH version"
58
59 2. as a RAM version which will not load from flash automatically as it needs a
60 prestage bootloader ("chainloading") & is running only from the RAM address it
61 is linked to => "RAM version"
62
63 This version may be very helpful when installing u-boot for the first time
64 since it can be used to make available s. th. like a "bootstrap
65 mechanism".
66
67
68How to build the different images:
69
70------------------------------
71Flash version
72------------------------------
73
74Compile u-boot
75
76in dir ./u-boot-x-x-x/
77
78please first check:
79
80 in ./include/configs/cobra5272.h
81
82 CONFIG_MONITOR_IS_IN_RAM has to be undefined, e. g. as follows:
83
84 #if 0
85 #define CONFIG_MONITOR_IS_IN_RAM
86 /* define if monitor is started from a pre-loader */
87 #endif
88
89 => u-boot as single bootloader starting from flash
90
91
Wolfgang Denk14d0a022010-10-07 21:51:12 +020092 in board/cobra5272/config.mk CONFIG_SYS_TEXT_BASE should be
wdenka562e1b2005-01-09 18:21:42 +000093
Wolfgang Denk14d0a022010-10-07 21:51:12 +020094 CONFIG_SYS_TEXT_BASE = 0xffe00000
wdenka562e1b2005-01-09 18:21:42 +000095
96 => linking address for u-boot as single bootloader stored in flash
97
98then:
99
100 host> make cobra5272_config
101 rm -f include/config.h include/config.mk
102 Configuring for cobra5272 board...
103 host> make
104 [...]
105
106 host> cp u-boot.bin /tftpboot/u-boot_flash.bin
107
108
109------------------------------
110RAM version
111------------------------------
112
113in dir ./u-boot-x-x-x/
114
115 host> make distclean
116
117please modify the settings:
118
119 in ./include/configs/cobra5272.h
120
121 CONFIG_MONITOR_IS_IN_RAM now has to be defined, e. g. as follows:
122
123 #if 1
124 #define CONFIG_MONITOR_IS_IN_RAM
125 /*define if monitor is started from a pre-loader */
126 #endif
127
128 => u-boot as RAM version, chainloaded by another bootloader or using bdm cable
129
130
Wolfgang Denk14d0a022010-10-07 21:51:12 +0200131 in board/cobra5272/config.mk CONFIG_SYS_TEXT_BASE should be
wdenka562e1b2005-01-09 18:21:42 +0000132
Wolfgang Denk14d0a022010-10-07 21:51:12 +0200133 CONFIG_SYS_TEXT_BASE = 0x00020000
wdenka562e1b2005-01-09 18:21:42 +0000134
135 => target linking address for RAM
136
137
138then:
139
140 host> make cobra5272_config
141 rm -f include/config.h include/config.mk
142 Configuring for cobra5272 board...
143 host> make
144 [...]
145
146 host> cp u-boot.bin /tftpboot/u-boot_ram.bin
147
148
149----
150HINT
151----
152
153If the m68k-elf-toolchain & the m68k-bdm-gdb is installed you can run the RAM
154version by typing (in dir ./u-boot-x-x-x/)
155"board/cobra5272/bdm/load-cobra_uboot" ,
156in ./u-boot-x-x-x/ the RAM version u-boot (elf format) has to be available.