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Hello, i am student of final year at UET lahore. my final year project is
to write a primary bootloading routine for dsp c6713 board that checks devices
and initializes memory and other devices(Power on self test).
i am currently in a great confusion about what actually is primary bootloader??
i can't just differentiate between primary and secondary bootloaders. can anyone
please guide me in this respect. i shall be greatly thankful to you.
regards
Tahir

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Hello Tahir,

On 10/22/07, c...@yahoo.com <c...@yahoo.com> wrote:
> Hello, i am student of final year at UET lahore. my final year project is
to write a primary bootloading routine for dsp c6713 board that checks devices
and initializes memory and other devices(Power on self test).
> i am currently in a great confusion about what actually is primary
bootloader?? i can't just differentiate between primary and secondary
bootloaders. can anyone please guide me in this respect. i shall be greatly
thankful to you.
I will try to express the boot loader information for your environment.
The terms 'primary bootloader' and 'hardware boot loader' are the
same.  When a 6713 is configured for 'ROM boot' and a hardware reset
is applied, the DSP internal hardware state machine enables CE1 and
copies the first 1024 bytes [0x400] in that address space to internal
memory beginning at address 0.  At the end of the transfer, the DSP
begins executing at address 0.  These 1024 bytes are the primary boot
loader.  If your entire program fits within these 1024 bytes, you are
finished or, if you want to execute from ROM, you can branch to and
address in ROM that contains the remainder of your program.  If you
require the faster execution of internal RAM, you must have code
within your primary boot loader to copy your ROM code into RAM.  The
process of getting the remainder [or the next chunk] of code into RAM
is often referred to as the secondary boot loader.  If the additional
code that was loaded was still not the 'real application' and had to
be retrieved from a network or disk drive, it would be referred to as
the tertiary [third level] loader.

I hope that this gets you started.

mikedunn
> regards
> Tahir
>

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Hi Tahir,

Do you understand bootloader? The Bootloader is the code that initializes and
test the system and allow the transfer of application code from an external
source into internal or external program memory. 

In some cases, you may want to boot through a peripheral which is not supported
by the available boot modes of the processor and the primary Bootloader. For
example, you may want to do an Ethernet boot via an EMAC peripheral. First, an
Ethernet Bootloader is loaded and then it executes, causing the rest of the
application to be loaded via the EMAC peripheral. 

Alternatively, there may be a need to customize the functionality provided by
the on-chip ROM Bootloader. This can be accomplished
using a Second Stage Bootloader, which can be loaded via any of the supported
bootmodes. In both the cases above, we needed the 2nd level/secondary
bootloader. 

I havent worked on DSP 6713, but have worked on 6455/6482. They have on-chip
bootloader, which we can call as primary bootloader. This bootloader initializes
the DSP and some of its on-chip peripherals. Since we wanted more from our
bootloader, we wrote a secondary bootloader, which can test DSP's memory and its
on-chip peripherals. We used to load the second-level bootloader through a host
processor using one of DSP's peripheral.

I hope the idea of seconday bootloader is clear now. If still it is unclear, you
are welcome to ask again.

- Aradhana
----- Original Message ----
From: "c...@yahoo.com" <c...@yahoo.com>
To: c...@yahoogroups.com
Sent: Tuesday, October 23, 2007 10:18:29 AM
Subject: [c6x] Primary bootloader and POST???
Hello, i am student of final year at UET lahore. my final year project is to
write a primary bootloading routine for dsp c6713 board that checks devices and
initializes memory and other devices(Power on self test).
i am currently in a great confusion about what actually is primary bootloader??
i can't just differentiate between primary and secondary bootloaders. can anyone
please guide me in this respect. i shall be greatly thankful to you.
regards
Tahir 

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