[ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Steven_cheng]

Dear all,

    I have one question about the RAM memory usage, because I 
found that the RAM address 0x0 -0xfcb8 is always used. 

The following list is presented in my environmenet:

1. ROM mode:
RAM: 0x00000000-0x10000000, [0x0000fcb8-0x0ffdd000] available

2. ROMRAM mode:
RAM: 0x00000000-0x10000000, [0x00042678-0x0ffdd000] available

3: RAM mode:
RAM: 0x00000000-0x10000000, [0x0007ebf8-0x0ffdd000] available


Anybody can tell me who use the RAM block between 0x0 and 0xfcb8 ??

Thank you~~


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Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Andrew Lunn]

On Wed, Aug 24, 2005 at 05:50:54PM +0800, Steven_cheng wrote:
> Dear all,
> 
>     I have one question about the RAM memory usage, because I 
> found that the RAM address 0x0 -0xfcb8 is always used. 
> 
> The following list is presented in my environmenet:
> 
> 1. ROM mode:
> RAM: 0x00000000-0x10000000, [0x0000fcb8-0x0ffdd000] available
> 
> 2. ROMRAM mode:
> RAM: 0x00000000-0x10000000, [0x00042678-0x0ffdd000] available
> 
> 3: RAM mode:
> RAM: 0x00000000-0x10000000, [0x0007ebf8-0x0ffdd000] available
> 
> 
> Anybody can tell me who use the RAM block between 0x0 and 0xfcb8 ??

Redboot
       
        Andrew

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Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Gary Thomas]

On Wed, 2005-08-24 at 17:50 +0800, Steven_cheng wrote:
> Dear all,
> 
>     I have one question about the RAM memory usage, because I 
> found that the RAM address 0x0 -0xfcb8 is always used. 
> 
> The following list is presented in my environmenet:
> 
> 1. ROM mode:
> RAM: 0x00000000-0x10000000, [0x0000fcb8-0x0ffdd000] available
> 

This is the workspace (variables, etc) for RedBoot

> 2. ROMRAM mode:
> RAM: 0x00000000-0x10000000, [0x00042678-0x0ffdd000] available
> 

Workspace + RedBoot code (instructions)

> 3: RAM mode:
> RAM: 0x00000000-0x10000000, [0x0007ebf8-0x0ffdd000] available
> 

Workspace + RedBoot code (instructions), this time loaded at a
higher address which does not conflict with what is used in 
ROMRAM mode.

> 
> Anybody can tell me who use the RAM block between 0x0 and 0xfcb8 ??
> 
> Thank you~~
> 

-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------


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Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Steven_cheng]

Dear All,

Thank you for your reply! But I have a question.

    Can I move the RedBoot workspace to other address, because I have
an application located at 0x0.  I hope to empty the address 0x0 in the ROM /
ROMRAM modes

How can I do for it ??

Thank you~~


----- Original Message ----- 
From: "Gary Thomas" <gary@mlbassoc.com>
To: "Steven_cheng" <05071@alphanetworks.com>
Cc: "eCos Discussion" <ecos-discuss@ecos.sourceware.org>
Sent: Wednesday, August 24, 2005 8:09 PM
Subject: Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??


> On Wed, 2005-08-24 at 17:50 +0800, Steven_cheng wrote:
> > Dear all,
> >
> >     I have one question about the RAM memory usage, because I
> > found that the RAM address 0x0 -0xfcb8 is always used.
> >
> > The following list is presented in my environmenet:
> >
> > 1. ROM mode:
> > RAM: 0x00000000-0x10000000, [0x0000fcb8-0x0ffdd000] available
> >
>
> This is the workspace (variables, etc) for RedBoot
>
> > 2. ROMRAM mode:
> > RAM: 0x00000000-0x10000000, [0x00042678-0x0ffdd000] available
> >
>
> Workspace + RedBoot code (instructions)
>
> > 3: RAM mode:
> > RAM: 0x00000000-0x10000000, [0x0007ebf8-0x0ffdd000] available
> >
>
> Workspace + RedBoot code (instructions), this time loaded at a
> higher address which does not conflict with what is used in
> ROMRAM mode.
>
> >
> > Anybody can tell me who use the RAM block between 0x0 and 0xfcb8 ??
> >
> > Thank you~~
> >
>
> -- 
> ------------------------------------------------------------
> Gary Thomas                 |  Consulting for the
> MLB Associates              |    Embedded world
> ------------------------------------------------------------
>
>
> -- 
> Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
> and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
>


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Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Andrew Lunn]

On Thu, Aug 25, 2005 at 11:34:09AM +0800, Steven_cheng wrote:
> 
> Dear All,
> 
> Thank you for your reply! But I have a question.
> 
>     Can I move the RedBoot workspace to other address, because I have
> an application located at 0x0.  I hope to empty the address 0x0 in the ROM /
> ROMRAM modes
> 
> How can I do for it ??

You need to modify the memory map. Take a look at the *ROMRAM.ldi and
*ROMRAM.h for your target. These two files controls what goes where in
memory. 

What processor is this? For ARM you however cannot free up the first
20 bytes. These are the interrupt vectors which RedBoot want to keep
control of until your application gets to run.

        Andrew

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Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Steven_cheng]

Dear Andrew,

        The processor of my platform is PowerPC 8245, the following are my
romram.ldi and romram.h.

/////////////////////  romram.ldi
MEMORY
{
    ram : ORIGIN = 0, LENGTH = 0x10000000
}

SECTIONS
{
    SECTIONS_BEGIN
    SECTION_vectors (ram, 0, LMA_EQ_VMA)
    SECTION_text (ram, 0x3400, LMA_EQ_VMA)
    SECTION_fini (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_rodata1 (ram, ALIGN (0x8), LMA_EQ_VMA)
    SECTION_rodata (ram, ALIGN (0x8), LMA_EQ_VMA)
    SECTION_fixup (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_gcc_except_table (ram, ALIGN (0x1), LMA_EQ_VMA)
    SECTION_data (ram, ALIGN (0x8), LMA_EQ_VMA)
    SECTION_sbss (ram, ALIGN (0x4), LMA_EQ_VMA)
    SECTION_bss (ram, ALIGN (0x10), LMA_EQ_VMA)
    CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
    SECTIONS_END
}

/////////////////////  romram.h
#define CYGMEM_REGION_ram (0)
#define CYGMEM_REGION_ram_SIZE (0x10000000)
#define CYGMEM_REGION_ram_ATTR (CYGMEM_REGION_ATTR_R | CYGMEM_REGION_ATTR_W)
#ifndef __ASSEMBLER__
extern char CYG_LABEL_NAME (__heap1) [];
#endif
#define CYGMEM_SECTION_heap1 (CYG_LABEL_NAME (__heap1))
#define CYGMEM_SECTION_heap1_SIZE (0x10000000 - (size_t) CYG_LABEL_NAME
(__heap1))


Questions:
 Q1 : How can I modify the files for memory address (0x0) emptying ??
 Q2 : Where can I get the detail information about the format and meaning
         of  ram.h  /ram.ldi / ram.mlt ?? Or document ??
 Q3: As above example, where is the label " __heap1" defined ?? I can't find
it.

Thank you ~~

Steven Cheng



----- Original Message ----- 
From: "Andrew Lunn" <andrew@lunn.ch>
To: "Steven_cheng" <05071@alphanetworks.com>
Cc: "eCos Discussion" <ecos-discuss@ecos.sourceware.org>
Sent: Thursday, August 25, 2005 3:22 PM
Subject: Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??


> On Thu, Aug 25, 2005 at 11:34:09AM +0800, Steven_cheng wrote:
> >
> > Dear All,
> >
> > Thank you for your reply! But I have a question.
> >
> >     Can I move the RedBoot workspace to other address, because I have
> > an application located at 0x0.  I hope to empty the address 0x0 in the
ROM /
> > ROMRAM modes
> >
> > How can I do for it ??
>
> You need to modify the memory map. Take a look at the *ROMRAM.ldi and
> *ROMRAM.h for your target. These two files controls what goes where in
> memory.
>
> What processor is this? For ARM you however cannot free up the first
> 20 bytes. These are the interrupt vectors which RedBoot want to keep
> control of until your application gets to run.
>
>         Andrew
>
> -- 
> Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
> and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
>


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Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Andrew Lunn]

On Thu, Aug 25, 2005 at 03:50:42PM +0800, Steven_cheng wrote:
> Dear Andrew,
> 
>         The processor of my platform is PowerPC 8245, the following are my
> romram.ldi and romram.h.
> 
> /////////////////////  romram.ldi
> MEMORY
> {
>     ram : ORIGIN = 0, LENGTH = 0x10000000
> }
> 
> SECTIONS
> {
>     SECTIONS_BEGIN
>     SECTION_vectors (ram, 0, LMA_EQ_VMA)
>     SECTION_text (ram, 0x3400, LMA_EQ_VMA)
>     SECTION_fini (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_rodata1 (ram, ALIGN (0x8), LMA_EQ_VMA)
>     SECTION_rodata (ram, ALIGN (0x8), LMA_EQ_VMA)
>     SECTION_fixup (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_gcc_except_table (ram, ALIGN (0x1), LMA_EQ_VMA)
>     SECTION_data (ram, ALIGN (0x8), LMA_EQ_VMA)
>     SECTION_sbss (ram, ALIGN (0x4), LMA_EQ_VMA)
>     SECTION_bss (ram, ALIGN (0x10), LMA_EQ_VMA)
>     CYG_LABEL_DEFN(__heap1) = ALIGN (0x8);
>     SECTIONS_END
> }
> 
> /////////////////////  romram.h
> #define CYGMEM_REGION_ram (0)
> #define CYGMEM_REGION_ram_SIZE (0x10000000)
> #define CYGMEM_REGION_ram_ATTR (CYGMEM_REGION_ATTR_R | CYGMEM_REGION_ATTR_W)
> #ifndef __ASSEMBLER__
> extern char CYG_LABEL_NAME (__heap1) [];
> #endif
> #define CYGMEM_SECTION_heap1 (CYG_LABEL_NAME (__heap1))
> #define CYGMEM_SECTION_heap1_SIZE (0x10000000 - (size_t) CYG_LABEL_NAME
> (__heap1))
> 
> 
> Questions:
>  Q1 : How can I modify the files for memory address (0x0) emptying ??
>  Q2 : Where can I get the detail information about the format and meaning
>          of  ram.h  /ram.ldi / ram.mlt ?? Or document ??

I don't know if there is any documentation. I've never needed any so
i've not looked.

>  Q3: As above example, where is the label " __heap1" defined ?? I can't find
> it.

CYG_LABEL_DEFN defines __heap1.

        Andrew

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Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Gary Thomas]

On Thu, 2005-08-25 at 11:34 +0800, Steven_cheng wrote:
> Dear All,
> 
> Thank you for your reply! But I have a question.
> 
>     Can I move the RedBoot workspace to other address, because I have
> an application located at 0x0.  I hope to empty the address 0x0 in the ROM /
> ROMRAM modes
> 
> How can I do for it ??

I don't know what platform/architecture you are using, but moving the
data space (RedBoot's workspace) to another location, while possible,
is probably a non-trivial job.

What kind of application do you have/need at 0x0?

> 
> Thank you~~
> 
> 
> ----- Original Message ----- 
> From: "Gary Thomas" <gary@mlbassoc.com>
> To: "Steven_cheng" <05071@alphanetworks.com>
> Cc: "eCos Discussion" <ecos-discuss@ecos.sourceware.org>
> Sent: Wednesday, August 24, 2005 8:09 PM
> Subject: Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??
> 
> 
> > On Wed, 2005-08-24 at 17:50 +0800, Steven_cheng wrote:
> > > Dear all,
> > >
> > >     I have one question about the RAM memory usage, because I
> > > found that the RAM address 0x0 -0xfcb8 is always used.
> > >
> > > The following list is presented in my environmenet:
> > >
> > > 1. ROM mode:
> > > RAM: 0x00000000-0x10000000, [0x0000fcb8-0x0ffdd000] available
> > >
> >
> > This is the workspace (variables, etc) for RedBoot
> >
> > > 2. ROMRAM mode:
> > > RAM: 0x00000000-0x10000000, [0x00042678-0x0ffdd000] available
> > >
> >
> > Workspace + RedBoot code (instructions)
> >
> > > 3: RAM mode:
> > > RAM: 0x00000000-0x10000000, [0x0007ebf8-0x0ffdd000] available
> > >
> >
> > Workspace + RedBoot code (instructions), this time loaded at a
> > higher address which does not conflict with what is used in
> > ROMRAM mode.
> >
> > >
> > > Anybody can tell me who use the RAM block between 0x0 and 0xfcb8 ??
> > >
> > > Thank you~~
> > >
> >
> > -- 
> > ------------------------------------------------------------
> > Gary Thomas                 |  Consulting for the
> > MLB Associates              |    Embedded world
> > ------------------------------------------------------------
> >
> >
> > -- 
> > Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
> > and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
> >
> 
> 
-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------


-- 
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss

Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Steven_cheng]

Dear Thomas,

            The processor of my platform is PowerPC 8245,
the application is our product application,  and it is made
by Nucleus Plus.  The application is located at 0x0,  and
it starts at 0x100. So we hope to use RedBoot to load this
application. The application is distributed and works for
a long time,  and it had better no change.

So how can I do for it ??

Thank you~

Steven Cheng


----- Original Message ----- 
From: "Gary Thomas" <gary@mlbassoc.com>
To: "Steven_cheng" <05071@alphanetworks.com>
Cc: "Andrew Lunn" <andrew@lunn.ch>; "eCos Discussion"
<ecos-discuss@ecos.sourceware.org>
Sent: Thursday, August 25, 2005 7:28 PM
Subject: Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??


> On Thu, 2005-08-25 at 11:34 +0800, Steven_cheng wrote:
> > Dear All,
> >
> > Thank you for your reply! But I have a question.
> >
> >     Can I move the RedBoot workspace to other address, because I have
> > an application located at 0x0.  I hope to empty the address 0x0 in the
ROM /
> > ROMRAM modes
> >
> > How can I do for it ??
>
> I don't know what platform/architecture you are using, but moving the
> data space (RedBoot's workspace) to another location, while possible,
> is probably a non-trivial job.
>
> What kind of application do you have/need at 0x0?
>
> >


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Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??

[Gary Thomas]

On Thu, 2005-08-25 at 21:50 +0800, Steven_cheng wrote:
> Dear Thomas,
> 
>             The processor of my platform is PowerPC 8245,
> the application is our product application,  and it is made
> by Nucleus Plus.  The application is located at 0x0,  and
> it starts at 0x100. So we hope to use RedBoot to load this
> application. The application is distributed and works for
> a long time,  and it had better no change.
> 
> So how can I do for it ??

The simplest way would be to write a new RedBoot command to
execute your code.  This command would take your application
image, loaded at some arbitrary location, turn off the MMU and
then move the application to location 0x0 before executing it.

This is quite similar to how the 'exec' function works on some
of the ARM platforms.

> Thank you~
> 
> Steven Cheng
> 
> 
> ----- Original Message ----- 
> From: "Gary Thomas" <gary@mlbassoc.com>
> To: "Steven_cheng" <05071@alphanetworks.com>
> Cc: "Andrew Lunn" <andrew@lunn.ch>; "eCos Discussion"
> <ecos-discuss@ecos.sourceware.org>
> Sent: Thursday, August 25, 2005 7:28 PM
> Subject: Re: [ECOS] who use the RAM block between 0x0 and 0xfcb8 ??
> 
> 
> > On Thu, 2005-08-25 at 11:34 +0800, Steven_cheng wrote:
> > > Dear All,
> > >
> > > Thank you for your reply! But I have a question.
> > >
> > >     Can I move the RedBoot workspace to other address, because I have
> > > an application located at 0x0.  I hope to empty the address 0x0 in the
> ROM /
> > > ROMRAM modes
> > >
> > > How can I do for it ??
> >
> > I don't know what platform/architecture you are using, but moving the
> > data space (RedBoot's workspace) to another location, while possible,
> > is probably a non-trivial job.
> >
> > What kind of application do you have/need at 0x0?
> >
> > >
> 
> 
-- 
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------


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Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss