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Redboot :: __startup_stack
- From: "Harsha D" <harshad at sanyo dot co dot in>
- To: <ecos-discuss at sources dot redhat dot com>
- Date: Fri, 1 Jul 2005 10:09:49 +0530
- Subject: [ECOS] Redboot :: __startup_stack
Hi
===============================================================
Porting : Redboot
Platform : ARM922T based board
source base : based on Excalibur package
===============================================================
Memory layout is
--------------------------
SRAM(32KB) 0x00000000 - 0x00008000
RAM(32MB) 0x20000000 - 0x02000000
===============================================================
My ram ldi file
---------------------
MEMORY
{
ram : ORIGIN = 0x20000000, LENGTH = 0x02000000
}
SECTIONS
{
SECTIONS_BEGIN
SECTION_fixed_vectors (ram, 0x20000020, LMA_EQ_VMA)
SECTION_rom_vectors (ram, 0x20300000, LMA_EQ_VMA)
SECTION_text (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_fini (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_rodata (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_rodata1 (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_fixup (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_gcc_except_table (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_data (ram, ALIGN (0x4), LMA_EQ_VMA)
SECTION_bss (ram, ALIGN (0x4), LMA_EQ_VMA)
CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
SECTIONS_END
}
[ I am loading redboot at 0x20300000]
=================================================================
What i am trying to do...
-----------------------------------
Trying to execute the redboot (ram version). I am using another small bootstrap program to
initialize/setup the platform. This at present i am not doing in Redboot, and plan to transfer
in the ROM version of Redboot.
I want to run Redboot => get messages on hyperterminal, able to connect from gdb and flash
writing
==================================================================
Problem
------------
The redboot.bin is executing but "+T050f....." message appears on
hypterterminal. When i traced i found that it is pointing to the
__startup_stack. When i disassemble ...
20300378 <.__GDB_stack>:
20300378: 2030ca70 eorcss ip, r0, r0, ror sl
2030037c <.__startup_stack>:
2030037c: 2030da70 eorcss sp, r0, r0, ror sl
20300380 <.__exception_stack>:
20300380: 2030b9f0 ldrcssh fp, [r0], -r0
20300384 <.__undef_exception_stack>:
20300384: 2030ba70 eorcss fp, r0, r0, ror sl
I am not able to find what is the error here. Googling told me that
fixed_vectors should be at 0x20(???) which is not the case for me.
Will it cause any problems ? If yes then how should i have my memory layout.
=====================================================================
Warm regards
harsha
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