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Re: Insight 5.1.1 with Angel /serial debugger
- From: Jonathan Larmour <jlarmour at redhat dot com>
- To: Jing Luo <Jing at vicom dot com>
- Cc: 'Charles-Henri Balet' <charles-henri at bluewin dot ch>,eCos Discuss <ecos-discuss at sources dot redhat dot com>
- Date: Fri, 01 Mar 2002 19:39:37 +0000
- Subject: Re: [ECOS] Insight 5.1.1 with Angel /serial debugger
- Organization: Red Hat UK Ltd.
- References: <B26EACBBAF91D411BD8500508BF7D695051D87@earth.vicom.com>
Jing Luo wrote:
>
> Hi,
> Thanks Jesper. Now I know porting eCos is not that easy.
Porting eCos to work with proprietary ROM monitors may not be as easy, no.
> I choose the second option you suggested - port Redboot.
>
> I changed the hal-platform-setup.h for hardware initialization.
>
> I want to start Redboot from RAM, but the problem is the memory layout came
> out is not the way I wanted as the following.
> [mlt_arm_mytarget_ram.ldi]
> // eCos memory layout - Thu Feb 28 18:55:04 2002
>
> // This is a generated file - do not edit
>
> #include <cyg/infra/cyg_type.inc>
>
> MEMORY
> {
> ram : ORIGIN = 0xc0000000, LENGTH = 0x2000000
> }
>
> SECTIONS
> {
> SECTIONS_BEGIN
> SECTION_fixed_vectors (ram, 0xc0000000, LMA_EQ_VMA)
> SECTION_rom_vectors (ram, 0xc0020000, 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
> }
>
> After build library and look in the map, __exception_handlers start from
> address 0x20000 which is in the ROM.
> I am confused about that. How can I make it run from RAM?
Compare with other ports and look at their .ldi files. For example, you'll
see that fixed_vectors should be at 0x20 generally.
> Have anyone had experience to run Redboot from RAM?
>
> Another question about the linker file:
> what LMA_EQ_VMA mean?
Load address is the same as the address the program is expected to run at.
This is correct for RAM startup.
Jifl
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