[U-Boot] SPL binary too large for OMAP4460 OCM

[Tom Rini]

On Wed, Sep 04, 2013 at 11:43:01AM +0300, Oleg Kosheliev wrote:
> Hi, Andr?
> 
> >________________________________________
> >From: u-boot-bounces at lists.denx.de [u-boot-bounces at lists.denx.de] on
> behalf of Andr? >Schaller [an.schall at googlemail.com]
> >Sent: Wednesday, September 04, 2013 10:09 AM
> >To: u-boot at lists.denx.de
> >Subject: [U-Boot] SPL binary too large for OMAP4460 OCM
> >
> >Hi everybody,
> >
> >I need to add functionality to the SPL code. I tried to implement in a
> >memory-saving way, however, the SPL is about 45 kB after compilation. To
> >get compilation working, I had to set CONFIG_SPL_MAX_SIZE to (45 *
> >1024). Now, the SPL as well as u-boot won't boot. After the device'
> >(PandaBoard ES - OMAP4460) reset, nothing happens regarding it's output
> >on terminal.
> >
> >My question: is it theoretically possible to to establish a successfully
> >booting SPL with ~45 kB in size for this device? The device'
> >on-chip-memory is 56kB so it could fit in there. If so, what needs to be
> >configured / tuned to get it working? Are there any other features I
> >could omit from the binary to make it smaller?
> >
> >Thanks a lot,
> >Andr?
> >_______________________________________________
> >U-Boot mailing list
> >U-Boot at lists.denx.de
> >http://lists.denx.de/mailman/listinfo/u-boot
> 
> We can use the area 0x40300000 - 0x4030bfff for downloading the SPL image.
> If the image exceed this - it leads to corrupting the ROM code stack and
> the device hangs up.
> See my patch [U-Boot] [RFC PATCH] armv7:omap4-common: Correct check of the
> SPL image size. (It's not in mainline. I'll do some corrections and send v2
> soon.)
> For HS devices the SPL image is loaded from the address 0x40304350. So we
> have 0x4030bfff - 0x40304350 = 0x7CAF = 31,919 bytes for SPL.
> The area from 0x40300000 till 0x40304350 in HS devices is used for security
> data.

FWIW, this issue is one reason I think we need to stop trying to make GP
devices work kinda-sorta like the HS devices do and instead add a CONFIG
for HS devices that sets things correctly.

-- 
Tom
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