Hi, I'm checking startup sequence in SDK6.0.2.
我think Reset_Handler in boot_vectors.s is the startup code.
But Reset_Handler does not have a routine of memory clear/copy (such like .bss .dat section for gcc).
在哪里做?
Device:
Tue, 2017-09-12 02:58
#1
Where is the startup code for memory clear/copy?
你好高手,
The booting code is burned in ROM and you're not able to see it from anywhere in the SDK. You may refer to chapter 4.3.3 in the Datasheet to get the workflow of DA14585's boot sequence.
Hi, Qinjiny
Thank you for very quick reply.
我think you mean "4.4.3 BootROM Sequence "in the Datasheet.
我t is written Remap SysRAM to addr 0x00 and SW reset at the end of BootROM Sequence(Figure 12: BootROM Sequence).
Do you mean startup memory clear/copy is done by burned ROM before SW reset?
我think C startup routine works after reset generally.
我found the following in the map file.
__scatterload 0x07fc828d Thumb Code 28 init.o(.text)
__scatterload_rt2 0x07fc828d Thumb Code 0 init.o(.text)
__scatterload_copy 0x07fc82b1 Thumb Code 14 handlers.o(i.__scatterload_copy)
__scatterload_null 0x07fc82bf Thumb Code 2 handlers.o(i.__scatterload_null)
__scatterload_zeroinit 0x07fc82c1 Thumb Code 14 handlers.o(i.__scatterload_zeroinit)
我guess these handle memory clear/copy.
And these are not provided in the source code as Qinjiny says.
But probably, these works correctly according to the scatter file.
Now I understand I do not need to care about it.
Thank you.