From: Jeroen Hofstee <jeroen@myspectrum.nl>
To: u-boot@lists.denx.de
Subject: [U-Boot] AM335x: enabling datacache in SPL slows down system?
Date: Mon, 24 Jun 2013 20:17:38 +0200 [thread overview]
Message-ID: <51C88D42.4060801@myspectrum.nl> (raw)
In-Reply-To: <20130624080148.f723f859@mail.altenpts.nl>
Hello Bas,
On 06/24/2013 10:01 AM, Bas van den Berg wrote:
> After debugging a bit more, I found that in our code, we didn't set the RAM size
> correctly (so no real RAM section was setup for caching). Fixing this fixed our
> time to 2.4 seconds (U-boot still took 1.8 sec).
>
> Adding your SRAM patch (modified, since AM335x has more SRAM),
> The load time dropped from 2.4 -> 1.9 seconds. So adding this small area saved
> half a second!
> I write off the remaing difference (1.8 vs 1.9 seconds) to code differences between
> our SPL and U-boot nand functions.
Thanks for reporting and checking that adding the SRAM region is
needed as well (I suppose you already verified that -O2 cannot get
rid of the last difference).
Regards,
Jeroen
ps: the consensus on this mailinglist is not to top post..
prev parent reply other threads:[~2013-06-24 18:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-20 8:05 [U-Boot] AM335x: enabling datacache in SPL slows down system? Bas van den Berg
2013-06-20 18:51 ` Jeroen Hofstee
2013-06-21 5:33 ` Wolfgang Denk
2013-06-21 18:46 ` Jeroen Hofstee
2013-06-21 18:56 ` Tom Rini
2013-06-24 8:01 ` Bas van den Berg
2013-06-24 18:17 ` Jeroen Hofstee [this message]
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