[U-Boot] Watchdog DM conversion, sram overflow(SPL)

[Jagan Teki]

On Wed, Jun 26, 2019 at 3:24 PM Suniel Mahesh <sunil.m at techveda.org> wrote:
>
> Hi,
>
> I am trying to convert watchdog driver(omap3_wdt) on TI AM33XX platform to Driver Model.
> Since DM is also enabled in SPL, size of SPL image generated(with watchdog DM enabled) is
> bigger compared to the SRAM size(.u_boot_list section doesn't fit in the region alloted)
> and build is failing with the following error:
>
>   LD      spl/drivers/usb/gadget/built-in.o
>   LD      spl/drivers/usb/musb-new/built-in.o
>   LD      spl/drivers/built-in.o
>   LD      spl/u-boot-spl
> arm-linux-ld.bfd: u-boot-spl section `.u_boot_list' will not fit in region `.sram'
> arm-linux-ld.bfd: region `.sram' overflowed by 48 bytes
> make[1]: *** [spl/u-boot-spl] Error 1
> make: *** [spl/u-boot-spl] Error 2
>
> The SRAM size in the device is 130047 bytes, of which 110592 bytes are allocated for SPL
> Image, 6144 bytes for stack and the rest 12799 bytes for RAM Exec vectors, tracing data
> and static variables.
>
> Maximum SPL image size is fixed at 110592 bytes
>
> SPL size without Watchdog driver model is 110880 bytes.
>
> So, the reason for such error is straight forward.
>
> I can think of two possible approaches (might be wrong):
>
> 1. either disable DM in SPL for watchdog ?
> (dm: mmc: Allow disabling driver model in SPL - by Simon Glass)
>
> 2. The stack allocated for SPL in SRAM is 6KB and 12799 bytes for  RAM Exec vectors,
> tracing data and static variables. can we do something here, by borrowing some bytes ?
>
> Or any possible solutions ?

00: platdata
01: CONFIG_*_TINY_* configs

If still unoccupied and want the DM for SPL in anycase, got for

02: TPL