boot loader

mctrivia · 2009-06-26 09:18

I really quickly threw together some code to act as a bootloader for a board with a 512k eeprom and sd card like my propmodules to allow for eeprom images to be installed from the sd card.

I need to write the pasm copy routine still to copy the top half of eeprom to hub ram but in the roughing out of the code I realized I am not sure how I can start the prop running the eeprom image after copying hence the

start prop???? line.

any ideas?

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Post Edited (mctrivia) : 6/30/2009 8:25:33 AM GMT

MagIO2 · 2009-06-26 12:48

First you have to start converting (or find a PASM replacement) of the Basic_I2C_Driver as this is completely written in SPIN.

Second thing is ... maybe you shouldn't start at adress 32768 for reading the upper part of the EEPROM. Instead you have to select the right adress (instead of i2C#EEPROM). At least this is my experience with my 64kB FRAM. It has adress $A0 for lower part and $A2 for upper part. Ok ... maybe not a real issue for you because you write the same way - having a 512k EEPROM which uses all available EEPROM adresses. But if you want to run your code on different setups it might be a problem.

For the starting of a new image, have a look at the Femto SD card driver. It provides exactly that functionality - load complete 32k image and run the SPIN interpreter. If you simply don't do a cogstop before, the drivers you loaded with the boot-loader can stay.

I plan to do the same thing somewhen, so if I don't find a PASM I2C driver I'll propably write one ... only I can't say when.

Kye · 2009-06-26 13:44

I wrote one of those a while back, it was in an incomplete form however, but the code is there for I2C acess... just not anything else.

Search for post by me mentioning I2C.

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Nyamekye,

Chad George · 2009-06-26 16:47

I pulled something from the archives...but I haven't dusted it off yet...

Its a serial bootloader that I used on a robot project last year. I'm going to be reworking this in the next few weeks so I didn't take the time to make an entire working demo of the program, but maybe it'll have what you're looking for.

The python script attached is capable of handling the PC side of things...the only non-standard library you'll need is PySerial.

and the whole project needs a better name... [noparse]:)[/noparse]

mctrivia · 2009-06-27 08:21

Well I have no hardware at the moment to test it but I have converted all the necisary spin to psam and it assembles. now to build more modules and see if it works.

What I am really not sure if it will work is the reseting of the prop.

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Post Edited (mctrivia) : 6/30/2009 8:26:06 AM GMT

Ariba · 2009-06-27 11:01

mctriva

To reboot the propeller from Assembly, write a new clkreg setting with bit7 set:

        ...
        'restart the prop
        CLKSET startre

        'no need to stop any cog here        
        ...
startre LONG  $80

Andy

mctrivia · 2009-06-28 11:03

i have run the code finaly. It takes about 14sec to load the code onto the top half of the eeprom but either my code to copy the top half of the eeprom to ram does not work or the reset code from Ariba is reloading the bottom half from the eeprom because after the first load it just keeps rebooting running the boot loader instead of running the code that was copied to hubram.

Changed the code to use .bin instead of .eeprom because it does not detect the longer extensions. added some code to let me see what is going on.

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Post Edited (mctrivia) : 6/30/2009 8:26:32 AM GMT

kuroneko · 2009-06-28 11:12

The reset he mentioned does exactly that:

The Manual said...
Same as a hardware reset – reboots the chip.

mctrivia · 2009-06-28 11:16

ok anyone know how i can make the prop reset to the begining of the code but not reload the code from eeprom since the code i want to run is what i just copied to ram?

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kuroneko · 2009-06-28 11:36

mctrivia said...
ok anyone know how i can make the prop reset to the begining of the code but not reload the code from eeprom since the code i want to run is what i just copied to ram?

IIRC fsrw offers boot from EEPROM and boot from SDCard. Either dig out the relevant bits or use it directly.

mctrivia · 2009-06-28 11:38

i saw boot from sdcard but could not figure out how it worked. did not see boot from eeprom. i will go look for that

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mctrivia · 2009-06-28 11:43

i am looking at femto fsrw. can't find iirc fsrw.

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kuroneko · 2009-06-28 11:56

mctrivia said...
i am looking at femto fsrw. can't find iirc fsrw.

Have a look at sdspiFemto.spin (they all fall under fsrw in my book [noparse]:)[/noparse]

hover1 · 2009-06-28 12:48

iirc = "If I Recall Correctley"

mctrivia said...
i am looking at femto fsrw. can't find iirc fsrw.

Ariba · 2009-06-28 18:36

When you have copied the code to the HubRAM beginning at address 0, then you can start the code with:

        ...
        cogid  self
        coginit interpreter     'start Spin Interpreter in Cog 0
        cogstop self             'and stop this ASM cog

interpreter     long    ($0004 << 16) | ($F004 << 2) | %0000
self    res 1

In this case you need to stop all the other running cogs before restarting the interpreter.

Andy

Mike Green · 2009-06-28 19:38

The sdspiFemto driver includes both a bootloader for EEPROM and for an SD card. The code that finishes up after the data file is read into memory is common to both functions.

mctrivia · 2009-06-28 20:24

well it would be nice to just use sdspiFemto then but I have read through the file and can not seem to figure out how to call it to boot from the code stored in the top half of a 512kb EEPROM.

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jazzed · 2009-06-28 20:36

@mctrivia, don't feel bad. I also have trouble following that code.

To me, the amount of commentary actually gets in the way of understanding what is important to know about using it ... sorry Mike. I specifically remember having trouble understanding the COG interface method, and thus went off and did something else.

Maybe Mike can explain in a few sentences what needs to be done with the object to fit your need?

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--Steve

Propalyzer: Propeller PC Logic Analyzer
http://forums.parallax.com/showthread.php?p=788230

Mike Green · 2009-06-28 20:51

The following is the EEPROM boot routine from FemtoBasic's sdspiFemto.spin object. This routine does everything you need to do to boot from any EEPROM address on any pair of I/O pins. It starts up the object, stops any running cogs other than the one calling this routine and the one it starts with the assembly loader in it, then starts the boot operation. To boot from the top half of a 64K byte boot EEPROM, if you declare sdspiFemto as the object "sdspi", you'd just call:

sdspi.bootEEPROM(sdspi#bootAddr + $8000)

PUB bootEEPROM(addr) | t, c0, c1                       '' Load and run a new SPIN program
  if not start(@c0)                                    ' Start up the I/O routines using a
    abort                                              '  local control block
  long[noparse][[/noparse]control][noparse][[/noparse] 1] := 0                                ' Check for the presence of EEPROM
  long[noparse][[/noparse]control][noparse][[/noparse] 0] := (ioReadCmd | ioLowSpeed) << 24 | (addr & $FFFFFF)
  repeat while long[noparse][[/noparse]control][noparse][[/noparse]0] & ioTestRdy            ' Wait for check to complete and
  if long[noparse][[/noparse]control][noparse][[/noparse] 0] & ioTestErr                      '  abort if there's an error
    abort
  repeat t from 0 to 7                                 ' Stop all COGs except this one and
    if (t <> cogid) and (t <> (cog-1))                 '  the one with the I2C driver in it
      cogstop(t)
  t := ioBootCmd | ioLowSpeed | ioStopLdr | cogid      ' Tell the I2C driver to load 32K
  long[noparse][[/noparse]control][noparse][[/noparse] 1] := $80000000                        '  into HUB RAM after stopping
  long[noparse][[/noparse]control][noparse][[/noparse] 0] := (t << 24) | (addr & $FFFFFF)     '   this calling cog
  repeat while long[noparse][[/noparse]control][noparse][[/noparse] 0] & ioTestRdy            ' Wait for this to finish
  return (long[noparse][[/noparse]control][noparse][[/noparse] 0] & ioTestErr) <> 0           ' Return any error code

The sdspi#bootAddr specifies the EEPROM on I/O pins 28/29 and the $8000 is the starting address of the .binary image in the EEPROM.

mctrivia · 2009-06-28 20:56

i must have an old version(2.003) then because there is not bootEEPROM function.

Thanks for the help will try right now

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mctrivia · 2009-06-28 21:23

well i think i am going to have to see if viewport still offers free trial. I have found the newest version of sdspiFemto and assuing Mike's code works(which I have no reason to think it wouldn't) then my code copying the eeprom image to the top half is not working.

When I run the program led 5 turns off(pin driven high) then 6,7,8,9,10 in order showing that it finds the card, code, copies it then tries to boot but then all lights turn off and nothing more happens. the image i am copying should run a test patern checking all io lines functionality.

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Post Edited (mctrivia) : 6/30/2009 8:27:00 AM GMT

Mike Green · 2009-06-28 21:36

You might use FemtoBasic or one of its other variations to copy a program from an SD card file to EEPROM. I've used a technique where I load a program into EEPROM (1st 32K), then load DongleBasic into RAM and use its COPY statement to copy the program from the 1st 32K to some other 32K area. You can also use FemtoBasic to examine the contents of EEPROM, perhaps compare what your code does with another area of EEPROM that FemtoBasic copies. There's a DUMP statement that will do a hex/ASCII dump of any area of any EEPROM. DongleBasic has the advantage that it uses pins 30/31 as the console and some kind of PC terminal program on the other end rather than a display and keyboard. You can save the terminal window and print it out if you want.

When you copy to EEPROM, you have to be careful of "page" boundaries, usually 128 bytes in the larger EEPROMs. Have a look at FemtoBasic's COPY statement for examples. It's roughly at line 1080 in FemtoBasic.spin.

Post Edited (Mike Green) : 6/28/2009 9:42:59 PM GMT

mctrivia · 2009-06-28 21:56

Thanks a terminal ap to see top half of eeprom is exactly what I need.

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mctrivia · 2009-06-29 03:03

having trouble with Dongle Basic I type in

DUMP 32768 200

and get an error message.

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mctrivia · 2009-06-30 06:40

well i have goten dongle basic working proper command to see top half of eeprom is

dump [noparse][[/noparse]$8000],32

shows first 32 bytes

attached code sucessfully copies the code into the top half of eeprom but does not yet copy top half of eeprom to hub ram and start it. Assembly routines are never used they were my attempt to do what

PRI loadTop
  light(10)

  sdspi.bootEEPROM(sdspi#bootAddr + $8000)

is suppose to do.

[noparse]:([/noparse]

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MagIO2 · 2009-06-30 08:41

In·· 'Load EEPROM code from uSD card
you should wait for the EEPROM after writing each page. EEPROMs need a while to do the write. First it has to clear the page and then write it. That's why it'll send an ACK after it's done. But you have to wait for it. So, maybe the first 32 bytes are correct, but I'd bet the next page won't be correct.
You have to add something like that:

        start_time := cnt ' prepare to check for a timeout
        repeat while i2c.WriteWait(i2c#BootPin, i2c#EEPROM, sstart)
          if cnt - start_time > clkfreq / 10
            ' vga.str(string("Copy EEPROM wait error",13))
            i:=false
            quit

sstart is the EEPROM-adress ($800+(j*PAGESIZE)) in your case.

·

mctrivia · 2009-06-30 08:56

you are exactly right. it works perfectly now.

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mctrivia · 2009-06-30 09:14

Is now in OBEX. obex.parallax.com/objects/473/

thank you to everyone for the help.

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mctrivia · 2009-06-30 09:23

seems i jumped the gun. for some reason hangs if no sd card in

added a watch dog timer during checking for sd card. now it works.

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Post Edited (mctrivia) : 6/30/2009 9:58:29 AM GMT

MagIO2 · 2009-06-30 11:49

Bad style for an Object to have the SD-pins fixed. You should add more constants to make it more flexible and keep the configuration data in the constant block.

'maincog:=cogid
is commented out - why?

You don't have error handling for the part waiting for the EEPROM. quit only stops the inner loop ... the outer one will still continue. But the content of the EEPROM might be rubbish.

It's a good idea to let the forum do a code review before you add some code to the ObjectExchange.

MagIO2 · 2009-06-30 12:24

PS: Just another thought ...

The boot-loader has a small footprint. So, there is no need to have a 64kB EEPROM. As long as the own code + bootloader code fits into the 32kB EEPROM why not update it in the normal EEPROM location?

pub bootLoader
....
if EEPROM_ADRESS>32191
· loadtop
else
· main

pub main
' here comes the user code in case you only have a 32kB EEPROM
' otherwise it stays empty

Post Edited (MagIO2) : 6/30/2009 12:32:36 PM GMT

boot loader

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