English
- +------------------------------------------------+
- | $TOPDIR/arch/mips/galileo/compressed/README |
- | |
- | By RidgeRun Inc, |
- | Aug, 2000 |
- +------------------------------------------------+
- Description:
- ============
- It is intended that this makefile be wired in to run as
- part of a top level linux build. For example, at the
- time of this writing, if the user types "make gboot" at
- the top level then in addition to building vmlinux the
- build system's makefiles will descend into this
- directory and build the "all:" target of this
- Makefile. This will have the result of compressing the
- vmlinux system and producing four separate systems. The
- following snippet is pulled from this directory's
- Makefile and describes each system.
- Four systems are availalbe for download to the EVB64120A
- board.
- 1. - ramsys -
- To be loaded into ram then run. When run
- it decompresses the "vmlinux" kernel housed in its internal
- data structures and then jumps to the image which
- results in a linux kernel boot.
- 2. - flashsys -
- To be loaded into ram so that it can be
- burned into the onboard flash. Then the board jumpers
- can be switched so that the next power cycle caused
- the system in flash to run which then proceeds as
- described by #1 above.
- Note: burner.srec is the utility that will allow
- the user to get this image into flash.
- 3. - flashsys2 -
- To be loaded into ram so that it can be
- burned into the onboard flash. Then on each power
- cycle when the standard PMON prompt is presented
- the user can type `call 0xbf000000` to invoke
- the system in flash which then proceeds as
- described by #1 above.
- Note: burner.srec is the utility that will allow
- the user to get this image into flash.
- 4. - burner.srec -
- Related to #2 and #3 above.
- Example: Running from Ram
- ==========================
- In this scenario the compressed system is downloaded
- into ram and run directly from there. No flash is involved
- in this scenario. Naturally, the download must be repeated
- on every power cycle.
- 1. At the PMON prompt type `load`
- 2. Assuming you have your host connected to /dev/ttyS0
- type the following command in a host shell window.
- `cat ramsys.srec > /dev/ttyS0`
- 3. When the download completes type the following
- at the PMON prompt: `g`
- Example: Running from flash: Scenario #1
- ========================================
- In this scenario vmlinux runs out of flash code
- automatically on every power up. This means that
- standard PMON code (of eprom) never runs.
- 1. Place the boot jumpers in the Boot-from-eprom
- state. This is the normal state and how the jumpers
- are found when booting PMON.
- Jumper settings. J11 - Removed
- J20 - Moved from the 1&2 position to
- the 2&3 position instead
- 2. Use PMON to "load" the burner.srec image and then
- run it. This utility will prompt you to download
- the image that you want burned into the flash
- part.
- 3. Send the flashsys.srec image to the running burner
- utility. The utililty will indicate when the burn
- process has completed.
- 4. Now switch off power and change the jumpers to
- the boot-from-flash position. The next power cycle
- will run the flash based system automatically.
- Jumper settings. J11 - Added.
- J20 - Moved from the 2&3 position to
- the 1&2 position instead
- Example: Running from flash: Scenario #2
- ========================================
- In this scenario vmlinux runs out of flash only if the
- PMON user decides to jump there by issuing a command to
- PMON. Every power cycle would continue to bring up PMON
- and a user will have to reissue the jump command to
- force control transfer to the flash system.
- 1. Insure that the boot jumpers are in the Boot-from-eprom
- state. This is the normal state and how the jumpers
- are found when booting PMON.
- Jumper settings. J11 - Removed
- J20 - Moved from the 1&2 position to
- the 2&3 position instead
- 2. Use PMON to "load" the burner.srec image and then
- run it. This utility will prompt you to download
- the image that you want burned into the flash
- part.
- 3. Send the flashsys2.srec image to the running burner
- utility. The utililty will indicate when the burn
- process has completed.
- 4. Now that the image is in flash the user can invoke
- the following PMON command whenever a vmlinux
- boot is desired:
- call 0xbf000000
