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After following the step of Yoo. Jonghoon and Wolfgang Denk,
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I ported u-boot on RPXlite DW version board: RPXlite_DW or LITE_DW.
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There are at least three differences between the Yoo-ported RPXlite and the RPXlite_DW.
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Board(in U-Boot) version(in EmbeddedPlanet) CPU SDRAM FLASH
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RPXlite RPXlite CW 850 16MB 4MB
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RPXlite_DW RPXlite DW(EP 823 H1 DW) 823e 64MB 16MB
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This fireware is specially coded for EmbeddedPlanet Co. Software Development
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Platform(RPXlite DW),which has a NEC NL6448BC20-08 LCD panel.
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It has the following three features:
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1. 64MHz/48MHz system frequence setting options.
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The default setting is 48MHz.To get a 64MHz u-boot,just add
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'64' in make command,like
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make distclean
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make RPXlite_DW_64_config
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make all
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2. CFG_ENV_IS_IN_FLASH/CFG_ENV_IS_IN_NVRAM
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The default environment parameter is stored in FLASH because it is a common choice for
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environment parameter.So I make NVRAM as backup parameter storeage.The reason why I
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didn't use EEPROM for ENV is that PlanetCore V2.0 use EEPROM as environment parameter
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home.Because of the possibility of using two firewares on this board,I didn't
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'disturb' EEPROM.To get NVRAM support,you may use the following build command:
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make distclean
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make RPXlite_DW_NVRAM_config
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make all
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3. LCD panel support
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To support the Platform better,I added LCD panel(NL6448BC20-08) function.
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For the convenience of debug, CONFIG_PERBOOT was supported. So you just
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perss ENTER if you want to get a serial console in boot downcounting.
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Then you can switch to LCD and serial console freely just typing
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'run lcd' or 'run ser'. They are only vaild when CONFIG_LCD was enabled.
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To get a LCD support u-boot,you can do the following:
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make distclean
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make RPXlite_DW_LCD_config
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make all
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The basic make commands could be:
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make RPXlite_DW_config
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make RPXlite_DW_64_config
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make RPXlite_DW_LCD_config
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make RPXlite_DW_NVRAM_config
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BTW,you can combine the above features together and get a workable u-boot to meet your need.
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For example,to get a 64MHZ && ENV_IS_IN_FLASH && LCD panel support u-boot,you can type:
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make RPXlite_DW_NVRAM_64_LCD_config
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make all
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So other combining make commands could be:
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make RPXlite_DW_NVRAM_64_config
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make RPXlite_DW_NVRAM_LCD_config
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make RPXlite_DW_64_LCD_config
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The boot process by "make RPXlite_DW_config" could be:
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U-Boot 1.1.2 (Aug 29 2004 - 15:11:27)
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CPU: PPC823EZTnnB2 at 48 MHz: 16 kB I-Cache 8 kB D-Cache
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Board: RPXlite_DW
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DRAM: 64 MB
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FLASH: 16 MB
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*** Warning - bad CRC, using default environment
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In: serial
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Out: serial
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Err: serial
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Net: SCC ETHERNET
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u-boot>
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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A word on the U-Boot enviroment variable setting and usage :
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In the beginning, you could just need very simple defult environment variable setting,
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like[include/configs/RPXlite.h] :
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#define CONFIG_BOOTCOMMAND \
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"bootp; " \
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"setenv bootargs root=/dev/nfs rw nfsroot=$(serverip):$(rootpath) " \
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"ip=$(ipaddr):$(serverip):$(gatewayip):$(netmask):$(hostname)::off; " \
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"bootm"
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This is enough for kernel NFS test. But as debug process goes on, you would expect
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to save some time on environment variable setting and u-boot/kernel updating.
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So the default environment variable setting would become more complicated. Just like
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the one I did in include/configs/RPXlite_DW.h.
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Two u-boot commands, ku and uu, should be careful to use. They were designed to update
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kernel and u-boot image file respectively. You must tftp your image to default address
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'100000' and then use them correctly. Yeah, you can create your own command to do this
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job. :-) The example u-boot image updating process could be :
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u-boot>t 100000 RPXlite_DW_LCD.bin
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Using SCC ETHERNET device
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TFTP from server 172.16.115.6; our IP address is 172.16.115.7
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Filename 'RPXlite_DW_LCD.bin'.
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Load address: 0x100000
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Loading: #############################
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done
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Bytes transferred = 144700 (2353c hex)
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u-boot>run uu
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Un-Protect Flash Sectors 0-4 in Bank # 1
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Erase Flash Sectors 0-4 in Bank # 1
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.... done
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Copy to Flash... done
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ff000000: 27051956 552d426f 6f742031 2e312e32 '..VU-Boot 1.1.2
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ff000010: 20284175 67203239 20323030 34202d20 (Aug 29 2004 -
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ff000020: 31353a32 303a3238 29000000 00000000 15:20:28).......
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ff000030: 00000000 00000000 00000000 00000000 ................
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ff000040: 00000000 00000000 00000000 00000000 ................
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ff000050: 00000000 00000000 00000000 00000000 ................
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ff000060: 00000000 00000000 00000000 00000000 ................
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ff000070: 00000000 00000000 00000000 00000000 ................
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ff000080: 00000000 00000000 00000000 00000000 ................
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ff000090: 00000000 00000000 00000000 00000000 ................
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ff0000a0: 00000000 00000000 00000000 00000000 ................
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ff0000b0: 00000000 00000000 00000000 00000000 ................
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ff0000c0: 00000000 00000000 00000000 00000000 ................
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ff0000d0: 00000000 00000000 00000000 00000000 ................
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ff0000e0: 00000000 00000000 00000000 00000000 ................
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ff0000f0: 00000000 00000000 00000000 00000000 ................
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u-boot updating finished
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u-boot>
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Also for environment updating, 'run eu' could let you erase OLD default environment variable
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and then use the working u-boot environment setting.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Finally, if you want to keep the serial port to possible debug on spot for deployment, you
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just need to enable 'DEPLOYMENT' in RPXlite_DW.h as 'DEBUG' does. Only the special string
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defined by CONFIG_AUTOBOOT_STOP_STR like 'st' can stop the autoboot.
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I'd like to extend my heartfelt gratitute to kind people for helping me work it out.
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I would particually thank Wolfgang Denk for his nice help.
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Enjoy,
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Sam Song, samsongshu@yahoo.com.cn
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Institute of Electrical Machinery and Controls
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Shanghai University
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Oct. 11, 2004
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