Re: Your PCB Is in the Mail & A Question

I pulled the writable flash segment address from
arch/armnommu/mach-cx821xx/cnxtflash.c.  There is also more info in the
cnxtflash.h file in the same directory.

Patrick M

--- "Bruce D. Lightner" <lightner-2huV/[email protected]> wrote:
> Patrick,
> 
> My wonderful wife Sherri sent your "home grown" development daughterboard 
> via US Priority Mail today.
> 
> Question...
> 
> I need help form an MTD driver expert...
> 
> You put this on the Wiki...
> 
>    Flash ROM map
> 
>    0x00400000:   Begin flash ROM
>    0x00400000:   boot loader
>    0x0040C000:   Begin OS writable flash segment (16k)
>    0x0040FFFF:   End OS writable flash segment
>    0x00410000:   compressed kernel image
>    0x004B0000:   start of ROM disk image (Taken from stock boot logs)
>    0x005FFFFF:   end of flash ROM
> 
> How did you determine the location of the "OS writable flash segment"?  I 
> believe this is the device /dev/mtdc0 and /dev/mtdc1.  My build of the 
> kernal always fails to open this device.  (See the end of this email for 
> my /dev/console log on boot.)
> 
> I've got my kernel build booting with a few less problems, including what 
> looks like some function in the modem chip.  I can get it to go off-hook, 
> and hang up, but not dial.  I managed to get the kernel to load an 
> important Actiontec "propriatary module" by adding some EXPORTs to the 
> kernel for two of the entry points the module was missing.  The module is 
> "/lib/modules/cnxtserial_buildin.o".  This clearly sets up the modem 
> somehow because now I have the modem UART device /dev/ttyS2 active.
> 
> However, the only thing I can't seem to get to work is the MTD device that 
> they are using to "configure" the PPP connection.  This is keeping the 
> device /dev/ppp from running.
> 
> There are a large number of configuration options for MTD drivers.  Have 
> you (or anyone else) got any clue as to how Actiontec built theirs?
> 
> I'm clueless in this area.  The error message...
> 
>    Can't allocate major number 31 for Memory Technology Devices.
> 
> ...is telling.  I don't know what I'm doing! :-)
> 
> Based on your "memory map", it looks like the "character mode" MTD device 
> that they are using uses a chunk of flash in the middle of flash memory. 
> How does one specify something like this?
> 
> Bottom line...does anyone have any ideas on how to "config" this device?
> 
> BTW: I still have to restore "boot-ldr.bin" each time I boot my kernel in 
> order to get my Actiontec box to reboot.  I can login and do whatever I 
> want after the *first* reboot, but when it's time to re-boot, the 
> "bootstrap" is gone!  What's up with that!?
> 
> Best regards,
> 
> Bruce
> 
> -- 
>   Bruce D. Lightner
>   Lightner Engineering
>   La Jolla, California
>   Voice: +1-858-551-4011
>   FAX: +1-858-551-0777
>   Email: lightner-2huV/[email protected]
>   URL: http://www.lightner.net/lightner/bruce/
> 

<snip>

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