On Wed, Jul 23, 2014 at 10:46:03AM -0400, [email protected] wrote: > On Wed, Jul 23, 2014 at 9:59 AM, Henrik Nordström > <[email protected]> wrote: > > ons 2014-07-23 klockan 09:27 -0400 skrev [email protected]: > > > >> That new uboot DRAM support from Siarhei has the potential to boot on > >> any Allwinner device. Once that hits we could do to a single generic > >> entry for Allwinner. Then after uboot is out of SPL uboot could use a > >> DTB to set everything else up optimally. > > > > You still need SPL tuning for optimal DRAM parameters. Not wise to mess > > with DRAM controller while you are running from DRAM as it's quite > > disruptive both blocking access and may even distort content. > > > > The generic parameters are however sufficiently good to allow booting > > and discovery of the device and it's "optimal" HW parameters to some > > extent. I.e. for use in installers, "safe fallback" etc. > > The uboot could re-SPL after patching in the optimal DRAM > parameteres.
IIRC, the u-boot guys are *very* reluctant to chain-loading u-boot. Plus, that would have quite a huge impact on the boot time. Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com
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