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<
quark_>
anyone here have tried to get uboot sdram init work with rk3399 and lpddr4?
<
anarsoul|2>
quark_: I don't thinkg so. You need lpddr4 params from vendor to get it working... I guess best way is to extract it from blob
<
quark_>
I have done that. and also did some modifications which are done differently in vendor blob
<
quark_>
But I didn
<
quark_>
t get read gate training work
<
quark_>
So if someone has done similar work it would be nice to share knowledge
<
anarsoul|2>
I haven't gotten to it yet
<
quark_>
lpddr4 code path in vendor blob is way different from ddr3/lpddr3 so just wondering how much work this would need
<
stikonas>
quark_: there is an attempt by somebody, not successful
<
stikonas>
at least for now
<
stikonas>
so that guy ordered HW debugger now
<
stikonas>
or is it actuall you here?
<
quark_>
I have done some research just with vendor blob. Some parts of it are quite similar to u-boot code
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<
stikonas>
quark_: wasn't there some code in coreboot repository?
<
anarsoul|2>
stikonas: I believe not for lpddr4, but I can be wrong
<
quark_>
yep there is. but it mostly some code as u-boot one
<
stikonas>
oh ok...
<
stikonas>
it has some references to LPDDR4...
<
quark_>
same as uboot code
<
anarsoul|2>
stikonas: it's likely to be not tested
<
stikonas>
well, I would say contact Akash Gajjar (from that u-boot mailing list) and try to cooperate
<
stikonas>
I also haven't managed to boot with my self-compiled ATF. But maybe it will be better once I can switch to upstream u-boot
<
quark_>
yep I suppose that one is not tested. But actually there is some differences to uboot code
<
quark_>
that one does not exists in u-boot side
<
stikonas>
well, hopefully it will help, but I guess chances are low
<
quark_>
also I saw this code in vendor blob
<
quark_>
it is commented out for some reason
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<
beeble>
quark_: i can tell you that the new driver will have some support for lpddr4 but as we don't use lpddr4 yet it is an untested codepath
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