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https://github.com/AsahiLinux/u-boot
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235 lines
6.6 KiB
Text
235 lines
6.6 KiB
Text
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SSV ADNP/ESC1 Embedded Softcore Computing
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Nios Softcore, Altera Cyclone FPGA
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Last Update: February 27, 2004
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====================================================================
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This file contains information regarding U-Boot and the SSV Embedded
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Nios Softcore Computing platform ADNP/ESC1. For general Nios
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information see doc/README.nios.
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Most stuff of this file was borrowed and based on README.dk1s10,
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the Altera DK-1S10 related information file.
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For those interested in contributing ... see HELP WANTED section
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in doc/README.nios.
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Contents:
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1. Files
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2. Memory Organization
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3. CPU Variations
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4. Examples
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5. Programming U-Boot into FLASH with GERMS
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6. Autoboot
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7. U-Boot environment convention and update philosophy
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====================================================================
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1. Files
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=========
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board/ssv/adnpesc1/*
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include/configs/ADNPESC1.h
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include/configs/ADNPESC1_base_32.h
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2. Memory Organization
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=======================
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For the most part, you can put things pretty much anywhere.
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This is pretty flexible for Nios. So here we make some arbitrary
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choices & assume that the monitor is placed at the end of a memory
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resource. So you must make sure TEXT_BASE is chosen appropriately.
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This is very important if you plan to move your memory to another
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place as configured at this time!
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-The heap is placed below the monitor (U-Boot code).
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-Global data is placed below the heap.
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-The stack is placed below global data (&grows down).
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(see doc/README.adnpesc1_base32 too)
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3. CPU Variations
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=================
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There are more than one NIOS CPU variation for the ADNP/ESC1 possible.
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U-Boot supports the following CPU configurations:
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- SSV Basis 32 (make ADNPESC1_base_32_config)
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- SSV Basis 32 at DNP evaluation base board 2
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(make ADNPESC1_DNPEVA2_base_32_config)
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4. Examples
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============
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The hello_world example works fine. To try out you have to change
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the default load address from 0x0100_0000 to 0x0204_0000 in
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examples/Makefile (the real SDRAM for default board configuration).
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5. Programming U-Boot into FLASH with GERMS
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============================================
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The current version of the ADNP/ESC1 port with the default
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configuration settings occupies about 97 KBytes of flash.
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A minimal configuration occupies less than 70 KByte
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(network, SPI, POST and board command support disabled). You
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can save more memory by deactivating the Hu-Shell support and
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long command help (CFG_HUSH_PARSER, CFG_LONGHELP).
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To program U-Boot into the ADNP/ESC1 flash using GERMS do the
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following:
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1. Download U-Boot to its target run space in SDRAM:
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a. Close jumper RCM_EN# and push the reset button.
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b. From the command line, download U-Boot using the
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nios-run:
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$ nios-run -r u-boot.srec
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NOTE: In some cases this want fail. I don't know why,
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but try again.
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This takes about 1 minute (GERMS is not very speedy here).
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After u-boot is downloaded it will be executed. You should
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see the following:
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U-Boot 1.0.2 (Jan 30 2004 - 12:59:15)
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CPU: Nios-32 Rev. 3.3 (0x3038)
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Reg file size: 512 LO_LIMIT/HI_LIMIT: 1/30
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Board: SSV DilNetPC ADNP/ESC1
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Conf.: SSV Base 32 (nios_32)
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In: serial
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Out: serial
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Err: serial
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ADNPESC1 >
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2. Quit nios-run and start your terminal application (e.g. start
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Hyperterminal or minicom).
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3. Download the u-boot code to RAM. When using Hyperterminal, do the
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following:
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a. From the u-boot command prompt start a binary download to SDRAM:
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at the SSV Basis 32 to SDRAM:
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==> loadb 2000100
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b. Download u-boot.bin using kermit.
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4. From the U-Boot command prompt, erase flash:
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at the SSV Basis 32 from 0x1000000 to 0x103ffff:
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==> protect off 1:0-3
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==> erase 1:0-3
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5. Copy the binary image from SDRAM to flash:
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at the SSV Basis 32 from SDRAM:
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==> cp.b 2000100 1000000 $filesize
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U-Boot will now automatically start when the board is powered on or
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reset using the SSV Basis 32 configuration without closed RCM jumper.
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To start U-Boot with closed RCM Jumper, enter the following GERMS
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command:
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+ g 1000000
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6. Autoboot
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===========
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U-Boot will try to boot a valid Nios application from Flash. For this
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it will use the deposited Hu-Shell script in environment variable
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'bootcmd' which is looking for a valid Nios application identifier
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string in Flash and go on at even its entry address. For more
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information see the next chapter.
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7. U-Boot environment convention and update philosophy
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======================================================
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U-Boot for the SSV ADNP/ESC1 target knows about many environment
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variables used to control the startup process, update process for
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raw Nios applications, and optionally file system image updates.
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In default configuration there are two Hu-Shell scripts to update
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the Nios application and/or the file system image:
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1. Update Nios application (ex. the uCLinux kernel):
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run 'appl_update'
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2. Update optional file system image (ex. RomFS image used by uCLinux):
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run 'fs_update'
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The Nios application can be any programm code generated in relation
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to the Nios application identifier -- the string "Nios" at offset
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address 0x0c. To use the scripts like described above in a secure way
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you have to check-up the next environment variables:
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1. update_allowed
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- Update switch -- must be set to '1' (one) to allow any update
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- default is '0' (zero)
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NOTE: You should avoid to save this variable with non zero
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value to Flash. Otherwise it would be allow any
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update process at any time!
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2. appl_entry_addr
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- Nios application area start address (usually in Flash)
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- this is the startup address for autoboot
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- each Nios application code we want to update will be copied
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to this address
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- default is CFG_ADNPESC1_NIOS_APPL_ENTRY
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3. appl_end_addr
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- Nios application area end address (usually in Flash)
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- will be used to unprotect/erase the Flash area while updating
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- default is CFG_ADNPESC1_NIOS_APPL_END
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4. appl_ident_addr
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- address of the Nios application identification string
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- this is the address checked-up by autoboot
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- default is CFG_ADNPESC1_NIOS_APPL_IDENT
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5. appl_ident_str
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- the Nios application identification string itself
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- default is CFG_ADNPESC1_NIOS_IDENTIFIER
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6. appl_name
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- name of file we have to download/update
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- default is ADNPESC1/base32/linux.bin
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7. fs_base_addr
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- optionally file system area start address (usually in Flash)
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- each file system we want to update will be copied to this address
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- default is CFG_ADNPESC1_FILESYSTEM_BASE
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8. fs_end_addr
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- optionally file system area end address (usually in Flash)
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- will be used to unprotect/erase the Flash area while updating
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- default is CFG_ADNPESC1_FILESYSTEM_END
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9. fs_name
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- name of file we have to download/update
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- default is ADNPESC1/base32/romfs.img
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