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Re: cyg_user_start fails to start
On Thu, 2005-01-27 at 10:50 -0800, Harshit Suri wrote:
> Thanks Andrew we have 1 MByte of external SRAM so i tried changing the
> hal_platform_setup.h :
> FROM ldr r2,=0x02010000
> TO ldr r2,=0x020FFFFF
>
> It still doesnt work this time some LEDs on the at91eb40a board stay
> permanently on.
> did i make the incorrect change?
This should be "ldr r2,=0x02100000". With the change you made, the
registers will never compare equal and thus it won't come up.
> thanks
>
>
>
>
> On Thu, 27 Jan 2005 09:37:47 +0100, Andrew Lunn <andrew@lunn.ch> wrote:
> > On Wed, Jan 26, 2005 at 05:42:15PM -0800, Harshit Suri wrote:
> > > The board is based on at91eb40a and has 1MegaByte of external SRAM.
> >
> > > Code works perfectly in RAMROM startup mode also ONLY IF
> > > readBuffer is given a small enough size eg.
> > > char readBuffer[1600]={'c'};
> >
> > This makes it very easy to track down the problem....
> >
> > Take a look at /packages/hal/arm/at91/eb40a/current/include/hal_platform_setup.h
> >
> > Around line 115 is:
> >
> > #if defined(CYG_HAL_STARTUP_ROMRAM)
> > ldr r0,=0x01000000 // Relocate FLASH/ROM to on-chip RAM
> > ldr r1,=0x02000000 // RAM base & length
> > ldr r2,=0x02010000
> > 20: ldr r3,[r0],#4
> > str r3,[r1],#4
> > cmp r1,r2
> > bne 20b
> > ldr r0,=30f
> > mov pc,r0
> > 30:
> > #endif
> >
> > This bit of code copies the image from ROM to RAM. As you can see if
> > copies a fixed amount.....
> >
> > Andrew
> >
--
------------------------------------------------------------
Gary Thomas | Consulting for the
MLB Associates | Embedded world
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