Re: [ECOS] Porting eCos / Redboot / Memory map modifications / E7T

[Andrew Lunn <andrew at lunn dot ch>]

On Sun, Oct 23, 2005 at 10:10:45AM +0000, Ali Sina wrote:
> Andrew, thanks again- both problems solved, following your advice below:
> - took the redoobot repository code and worked from there
> - disabled the init of UART0 in hal_diag.c
> 
> Now one small thing is left regarding the redboot start address 
> modification:
> 
> - I have noticed that upon hardware reset everything works fine.
> However, when calling "reset" from within redboot, it seems that the
> flash is somehow not properly seen. See output below:
> 
> ----
> RedBoot> reset
> ... Resetting.
> +FLASH: driver init failed: Driver does not support device

This is strange. Normally warm reset and flash problems means the
system hangs solid. The normal problem is that a flash erase/write
operation is active when the warm reset happens. Two things can then
happen:

The warm-reset causes the reset CPU pin to be active and the flash is
connected to this, so gets reset back into read mode.

The flash is not connected to the reset pin so stays in erase/write
mode. All subsequent reads result in the flash returning status
information, not contents of the flash. So the CPU has only junk to
execute and crashs imeadietly.

You seem to have something else happening. It is booting so the flash
must be readable. Yet the flash is not responding correctly to the ID
request. You might want to print out the ID information. Take a look
at the flash_query() function for the flash driver you are using. Does
the values it is returning look like an ID? Does it look like status
information?

This is probably something you want to fix before going into
production. The watchdog code uses the same process to reboot the
system. So the watchdog is not going to work. There is also a
posibility this is a hardware problem with the flash resets. So you
might want to get your hardware people to take a look just to make
sure everything is as it is supposed to be.

        Andrew

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