Santoch,
Here are some comments/ideas:
1. The address 0xFFFF should contain the address of the 0x10AA, not the
0x10AA itself.
In other words, the DSP should read something like 0x8000 (the address of
your flash memory), then it jumps to that address (0x8000), and it should
find there the magic number 0x10AA (for a 16-bit flash).
2. I do the same thing (booting from a flash memory), but I use ONE 8-bit
flash memory. To give the flash address to the DSP, I use two 8-bit drivers
(with the flash address hard-coded on the input side) that are turned on
(selected at address 0xC000 and above) and read by the DSP at boot. My 8-bit
flash memory is located at address 0x8000 and the first bytes contain (0x08
and 0xAA).
3. Our application program is "self-writable" and contains a
routine
(PgmFlashWrite) for writing into the flash memory.
Here is how it works:
- The application program is loaded into the DSP RAM through the JTAG port.
- When the program is executed (through the J-TAG), it goes to the
PgmFlashWrite routine because the first thing that it does (after
initialization) is a GOTO to the PgmFlashWrite routine.
- The PgmFlashWrite routine: (a) replaces the GOTO with NOP's, (b)
writes
the boot table into the flash (the one that contains the 0x08AA and so on),
and (c) writes itself into the flash.
When you make a reset, the DSP will load the program from the flash memory,
but will not write itself into the flash because the GOTO is replaced with
NOP's.
That's it!
Best regards to all,
Raymond
----- Original Message -----
From: "Santosh M Nadig" <>
To: <>
Sent: Sunday, February 03, 2002 10:45 AM
Subject: [c54x] Booting 5410 from flash
> Hello all,
>
> I have a problem with booting 5410 from Flash (two 8-bit flash. one for
> upper 8 bits and other for the lower 8 bits). The bootloader document
says
> that the bootloader reads 0FFFF location of I/O or Data memory to find a
> valid keyword (10AA or 08AA). But, When I use the hex-conversion utility
> (hex500) how do I specify that?? If anyone has a sample command file for
> hex500 please send it to me.
>
> Thanks
> Santosh
>
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