Reply by zeta_alpha2002●December 5, 20052005-12-05
>So once the Bootloader is moved to RAM, > it is not able to use address space $F000 as RAM
instead of address space > $3000.
Why not use the AN2548/D. I have already fix or ported it for the
S12X. It just uses a small portion in stack to write and erase FLASH.
Right now I am waiting for my GUI guy to fix the uBUG12 from
Technological Arts to support S12X.
Reply by Jean-Sebastien Bouchard●December 5, 20052005-12-05
My problem is with the RAM address space relocation. the XGATE family doest
not support memory space relocation. So once the Bootloader is moved to RAM,
it is not able to use address space $F000 as RAM instead of address space
$3000.
_____
From: 68HC12@68HC... [mailto:68HC12@68HC...] On Behalf Of
zeta_alpha2002
Sent: December 2, 2005 4:17 PM
To: 68HC12@68HC...
Subject: [68HC12] Re: Serial Bootloader for HCS12xDP512
>but there might be a way
> around this.
I did a quick look. You Change ppage $30 (document page 46) to start
at $E0 and ends at $FF for the erase routine.
Reply by zeta_alpha2002●December 2, 20052005-12-02
>but there might be a way > around this.
I did a quick look. You Change ppage $30 (document page 46) to start
at $E0 and ends at $FF for the erase routine.
I think the major changes are where the start of PPAGEs. The other
issue might that the SrecCVT in bank mode maynot support PPAGEs to
cover upto PPAGE = $FF. Anyway, that is what my experiment tells me.
Hopefully other may have some insights.
Reply by David Wild●December 2, 20052005-12-02
I have no idea what that bootloader was like, but making a bootloader
from
scratch for the 9S12 is pretty simple.
Simply make it resident in FE00-FFFF and make sure to include a pseudovector
reference table above the real one (which is at FFDO) I think.
-----Original Message-----
From: 68HC12@68HC... [mailto:68HC12@68HC...] On Behalf Of
jsbouchard1978
Sent: Friday, December 02, 2005 1:54 PM
To: 68HC12@68HC...
Subject: [68HC12] Re: Serial Bootloader for HCS12xDP512
I mean the serial bootloader from Freescale AN2153
--- In 68HC12@68HC..., "jsbouchard1978" <js.bouchard@m...>
wrote: >
> Is there something available to replace the serial bootloader that was > available with MC9S12DP256B?
>
> If not, has anyone attempted to modify this serial bootloader created > for the MC9S12DP256B to adapt it to the
MC9S12XDP512?
>
> I know that the original code won't work because of the RAM mapping
> that is not available on the XGATE series, but there might be a way
> around this.
>
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Reply by jsbouchard1978●December 2, 20052005-12-02
I mean the serial bootloader from Freescale AN2153
--- In 68HC12@68HC..., "jsbouchard1978" <js.bouchard@m...>
wrote: >
> Is there something available to replace the serial bootloader that was > available with MC9S12DP256B?
>
> If not, has anyone attempted to modify this serial bootloader created > for the MC9S12DP256B to adapt it to the
MC9S12XDP512?
>
> I know that the original code won't work because of the RAM mapping
> that is not available on the XGATE series, but there might be a way
> around this.
>
Reply by jsbouchard1978●December 2, 20052005-12-02
Is there something available to replace the serial bootloader that was
available with MC9S12DP256B?
If not, has anyone attempted to modify this serial bootloader created
for the MC9S12DP256B to adapt it to the MC9S12XDP512?
I know that the original code won't work because of the RAM mapping
that is not available on the XGATE series, but there might be a way
around this.