标题: A question about C5421’bootloader [打印本页] 作者: slinqiu@yahoo.c 时间: 2003-7-17 08:54 标题: A question about C5421’bootloader
Big Bear
--- In sc_dsp_group@yahoogroups.com, "telefeng12"
wrote:
> Thank you! I want to ask you a question about C5421’bootloader.I
> have two technical artical about the question--SPRA628A and
> SPRS098C,and i have seen them some times.My question is as
follow:i
> use SST's flash to to boot C5421,the flash address is 0x8000-
0xFFFF
> in the data memory map.According to the aritcal SPRA628A-C5421
> Bootloader Technical Reference,i write the follow data:10AA 7FFF
F000
> 0000 5000 0013 0000 5000 and other data about letting the LED
gliter
> to the FLASH's start address--0x8000.The program about letting the
> LED gliter is run correctly when i use CCS to debug it.But it
doesnot
> work correctly when i reset the cpu in the CCS and turn off and
then
> turn on the power.I donot konw where's the problem.The artical
> SPRA628A says that the user must use the DMA memory map address
for
> the load address appropriately.But i cannot understand the DMA
memory
> map exactly and i donnot know whether the "memory location 0000h"
in
> the SPRA628A is the FLASH's start address--0x8000.On the other
> hand,what shall i take notice about the pins except the pin
> XIO,GPIO0/ROMEN and GPIO1?And whan shall i do next?
> Thank you!Please sent E-mail to me :telefeng12@b...
>
> The problem will occur when i use the menu command "reset cpu" in
the
> CCS and turn on the power.I want to know how to configure the DMA
> memory map and how can i map the flash start adress--0x8000 to the
> 0000h in the DMA data memory map? Thank you very much! I'm eager
for
> your answer.
Answer：
So you are stuck with what "DMA memory map" is.
There are three memory maps in TI's DSP. They are,
1. CPU memory map:
the range of memory which CPU can access.
2. HPI memory map:
the range of memory which host can access via HPI port.
3. DMA memory map:
the range of memory which DMA controller can access.
The VC5421 DMA memory map is described on section 3.8 of
its data sheet (SPRS098c)
