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Re: cyg_user_start fails to start


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?
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
>

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