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