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

Suniel Mahesh sunil.m at techveda.org
Wed Jun 26 12:51:35 UTC 2019

On 26/06/19 16:49, Marek Vasut wrote:
> On 6/26/19 12:54 PM, Jagan Teki wrote:
>> On Wed, Jun 26, 2019 at 4:07 PM Stefan Roese <sr at denx.de> wrote:
>>> On 26.06.19 11:53, Suniel Mahesh 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 ?
>>> You could also disable the watchdog in SPL and only enable it
>>> later in U-Boot proper.
>> May be his requirement is to reset the watchdog if SPL hang or something.
> Non-DM WDT support can do that just fine.
My question was that can we do a Non-DM WDT in SPL, which was my first item above.

I will try for a Non-DM WDT in SPL.

Thanks Jagan, Stefan, Marek for the quick reply and suggestions.

Suniel Mahesh

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