On Tue, Jun 21, 2016 at 12:48:45PM -0700, Eric Nelson wrote: > On 06/21/2016 11:41 AM, Eric Nelson wrote: > > This patch set makes use of the dynamic DDR calibration routines added in > > commit > > d339f16 to define an alternative to the Freescale DDR stress tester tool. > > > Hi all, > > While preparing this patch set, I thought again about the tools we have > for managing SPL images, and especially "first boot" issues (when a > full U-Boot isn't available or isn't programmed into the normal boot > device). > > Since the "mx6memcal" device is deliberately small, with only > the DDR and UART defined, there's no way to load a full U-Boot > and doing so would defeat the primary purpose. > > We've discussed this at length on a number of occasions, (most recently > in [5]) but I don't think we have a good solution. > > I just looked at Troy's ancient patches ([1] and [2]) and it seems that > these two patches are the bulk of the work needed to build a combined > SPL+U-Boot image, and if I understand patch 2 correctly, SPL could > tell at run-time that it was executed via a plugin and return control > to the Boot ROM instead of trying to load U-Boot or a kernel. > > If I recall correctly, Troy dropped these patches because of push-back > that came from the sheer size of the 21-patch set, and not because of > any particular objection to support for plugins. > > It seems that a little work here would remove the need for things > like Stefano's patch in [3] or Michael thoughts of adding DFU support > in [4]. > > I'm interested in hearing your thoughts on the subject.
So, if I read the commentary right, "plugin" is how we can eventually get to the point where we can support, in a single binary, somewhat disparate board / SoC types because we can have enough smarts there to see if it's a Q or D or DL and so forth, right? That would be worthwhile to support, yes. -- Tom
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