* Patch by Stephan Linz, 09 Mar 2004
- Add support for the SSV ADNP/ESC1 (Nios Softcore)
* Patch by George G. Davis, 9 Mar 2004:
fix recent build failure for SA1100 target
* Patch by Travis Sawyer, 09 Mar 2004:
Support native interrupt mode for the IBM440GX.
Previously it was running in 440GP compatibility mode.
diff --git a/doc/README.adnpesc1 b/doc/README.adnpesc1
new file mode 100644
index 0000000..1d3dff2
--- /dev/null
+++ b/doc/README.adnpesc1
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+
+ SSV ADNP/ESC1 Embedded Softcore Computing
+ Nios Softcore, Altera Cyclone FPGA
+
+ Last Update: February 27, 2004
+====================================================================
+
+This file contains information regarding U-Boot and the SSV Embedded
+Nios Softcore Computing platform ADNP/ESC1. For general Nios
+information see doc/README.nios.
+
+Most stuff of this file was borrowed and based on README.dk1s10,
+the Altera DK-1S10 related information file.
+
+For those interested in contributing ... see HELP WANTED section
+in doc/README.nios.
+
+Contents:
+
+ 1. Files
+ 2. Memory Organization
+ 3. CPU Variations
+ 4. Examples
+ 5. Programming U-Boot into FLASH with GERMS
+ 6. Autoboot
+ 7. U-Boot environment convention and update philosophy
+
+====================================================================
+
+1. Files
+=========
+ board/ssv/adnpesc1/*
+ include/configs/ADNPESC1.h
+ include/configs/ADNPESC1_base_32.h
+
+
+2. Memory Organization
+=======================
+
+For the most part, you can put things pretty much anywhere.
+This is pretty flexible for Nios. So here we make some arbitrary
+choices & assume that the monitor is placed at the end of a memory
+resource. So you must make sure TEXT_BASE is chosen appropriately.
+This is very important if you plan to move your memory to another
+place as configured at this time!
+
+ -The heap is placed below the monitor (U-Boot code).
+ -Global data is placed below the heap.
+ -The stack is placed below global data (&grows down).
+
+(see doc/README.adnpesc1_base32 too)
+
+
+3. CPU Variations
+=================
+
+There are more than one NIOS CPU variation for the ADNP/ESC1 possible.
+U-Boot supports the following CPU configurations:
+
+ - SSV Basis 32 (make ADNPESC1_base_32_config)
+ - SSV Basis 32 at DNP evaluation base board 2
+ (make ADNPESC1_DNPEVA2_base_32_config)
+
+
+4. Examples
+============
+
+The hello_world example works fine. To try out you have to change
+the default load address from 0x0100_0000 to 0x0204_0000 in
+examples/Makefile (the real SDRAM for default board configuration).
+
+
+5. Programming U-Boot into FLASH with GERMS
+============================================
+
+The current version of the ADNP/ESC1 port with the default
+configuration settings occupies about 97 KBytes of flash.
+A minimal configuration occupies less than 70 KByte
+(network, SPI, POST and board command support disabled). You
+can save more memory by deactivating the Hu-Shell support and
+long command help (CFG_HUSH_PARSER, CFG_LONGHELP).
+
+To program U-Boot into the ADNP/ESC1 flash using GERMS do the
+following:
+
+1. Download U-Boot to its target run space in SDRAM:
+
+ a. Close jumper RCM_EN# and push the reset button.
+
+ b. From the command line, download U-Boot using the
+ nios-run:
+
+ $ nios-run -r u-boot.srec
+
+ NOTE: In some cases this want fail. I don't know why,
+ but try again.
+
+This takes about 1 minute (GERMS is not very speedy here).
+After u-boot is downloaded it will be executed. You should
+see the following:
+
+ U-Boot 1.0.2 (Jan 30 2004 - 12:59:15)
+
+ CPU: Nios-32 Rev. 3.3 (0x3038)
+ Reg file size: 512 LO_LIMIT/HI_LIMIT: 1/30
+ Board: SSV DilNetPC ADNP/ESC1
+ Conf.: SSV Base 32 (nios_32)
+ In: serial
+ Out: serial
+ Err: serial
+ ADNPESC1 >
+
+
+2. Quit nios-run and start your terminal application (e.g. start
+ Hyperterminal or minicom).
+
+3. Download the u-boot code to RAM. When using Hyperterminal, do the
+ following:
+
+ a. From the u-boot command prompt start a binary download to SDRAM:
+
+ at the SSV Basis 32 to SDRAM:
+
+ ==> loadb 2000100
+
+ b. Download u-boot.bin using kermit.
+
+4. From the U-Boot command prompt, erase flash:
+
+ at the SSV Basis 32 from 0x1000000 to 0x103ffff:
+
+ ==> protect off 1:0-3
+ ==> erase 1:0-3
+
+5. Copy the binary image from SDRAM to flash:
+
+ at the SSV Basis 32 from SDRAM:
+
+ ==> cp.b 2000100 1000000 $filesize
+
+U-Boot will now automatically start when the board is powered on or
+reset using the SSV Basis 32 configuration without closed RCM jumper.
+To start U-Boot with closed RCM Jumper, enter the following GERMS
+command:
+
+ + g 1000000
+
+
+6. Autoboot
+===========
+
+U-Boot will try to boot a valid Nios application from Flash. For this
+it will use the deposited Hu-Shell script in environment variable
+'bootcmd' which is looking for a valid Nios application identifier
+string in Flash and go on at even its entry address. For more
+information see the next chapter.
+
+
+7. U-Boot environment convention and update philosophy
+======================================================
+
+U-Boot for the SSV ADNP/ESC1 target knows about many environment
+variables used to control the startup process, update process for
+raw Nios applications, and optionally file system image updates.
+In default configuration there are two Hu-Shell scripts to update
+the Nios application and/or the file system image:
+
+1. Update Nios application (ex. the uCLinux kernel):
+
+ run 'appl_update'
+
+2. Update optional file system image (ex. RomFS image used by uCLinux):
+
+ run 'fs_update'
+
+The Nios application can be any programm code generated in relation
+to the Nios application identifier -- the string "Nios" at offset
+address 0x0c. To use the scripts like described above in a secure way
+you have to check-up the next environment variables:
+
+1. update_allowed
+
+ - Update switch -- must be set to '1' (one) to allow any update
+ - default is '0' (zero)
+
+ NOTE: You should avoid to save this variable with non zero
+ value to Flash. Otherwise it would be allow any
+ update process at any time!
+
+2. appl_entry_addr
+
+ - Nios application area start address (usually in Flash)
+ - this is the startup address for autoboot
+ - each Nios application code we want to update will be copied
+ to this address
+ - default is CFG_ADNPESC1_NIOS_APPL_ENTRY
+
+3. appl_end_addr
+
+ - Nios application area end address (usually in Flash)
+ - will be used to unprotect/erase the Flash area while updating
+ - default is CFG_ADNPESC1_NIOS_APPL_END
+
+4. appl_ident_addr
+
+ - address of the Nios application identification string
+ - this is the address checked-up by autoboot
+ - default is CFG_ADNPESC1_NIOS_APPL_IDENT
+
+5. appl_ident_str
+
+ - the Nios application identification string itself
+ - default is CFG_ADNPESC1_NIOS_IDENTIFIER
+
+6. appl_name
+
+ - name of file we have to download/update
+ - default is ADNPESC1/base32/linux.bin
+
+7. fs_base_addr
+
+ - optionally file system area start address (usually in Flash)
+ - each file system we want to update will be copied to this address
+ - default is CFG_ADNPESC1_FILESYSTEM_BASE
+
+8. fs_end_addr
+
+ - optionally file system area end address (usually in Flash)
+ - will be used to unprotect/erase the Flash area while updating
+ - default is CFG_ADNPESC1_FILESYSTEM_END
+
+9. fs_name
+
+ - name of file we have to download/update
+ - default is ADNPESC1/base32/romfs.img