#linux-amlogic on 2023-09-12 — irc logs at libera.irclog.whitequark.org

2021-06-01 12:24 narmstrong changed the topic of #linux-amlogic to: Amlogic mainline kernel development discussion - our wiki http://linux-meson.com/ - ml linux-amlogic@lists.infradead.org - official channel moved from Freenode - publicly logged on https://libera.irclog.whitequark.org/linux-amlogic

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13:27 <f_> narmstrong: https://git.vitali64.duckdns.org/archive/amlogic-bl2.git/tree/plat/gxb/ddr/ddr.c#n70

13:28 <narmstrong> yes it inits the DDR PLL, not the system PLL

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13:28 <f_> indeed

13:28 <narmstrong> but you may have a problem if the system bus is underclocked

13:28 <f_> Yeah I also noticed the lack of any debugging info whatsoever

13:29 <f_> But then why did my hacked up port work in TF-A with no system pll init?

13:29 <f_> Is Amlogic code that magic?

13:29 <f_> Or did I actually init the pll but don't remember?

13:30 <f_> https://git.vitali64.duckdns.org/misc/trustedfirmware-a.git/tree/plat/amlogic/gxbb/gxbb_bl2_setup.c?h=wip/gxbb&id=aaf0f79c79c9a0cf331ed1d49efdda93cb659cc0

13:30 <f_> https://git.vitali64.duckdns.org/misc/trustedfirmware-a.git/tree/?h=wip/gxbb&id=aaf0f79c79c9a0cf331ed1d49efdda93cb659cc0

13:31 <f_> This tree compiles and can init the DDR successfully, for sure.

13:35 <f_> Ironically PLL init code is much more documented than DDR init code

13:36 <narmstrong> well if you kept the bl2_arch_setup() the it called pll init, no ?

13:37 <f_> That's upstream TF-A, not Amlogic TF-A

13:37 <f_> Amlogic wrongly modified the bl2_arch_setup() function which is actually global and used in all boards

13:38 <f_> What you're supposed to do is declare a bl2_plat_arch_setup() function

13:39 <f_> https://git.vitali64.duckdns.org/misc/trustedfirmware-a.git/tree/plat/amlogic/gxbb/gxbb_bl2_setup.c?h=wip/gxbb&id=969247f6a22a50aa3b8198c0b1b2cd3108cd1768#n81 and this is how it looked like

13:39 <f_> in the tree where DDR init seems to work

13:41 <f_> https://git.vitali64.duckdns.org/misc/trustedfirmware-a.git/tree/bl2/aarch64/bl2_arch_setup.c?h=wip/gxbb&id=969247f6a22a50aa3b8198c0b1b2cd3108cd1768#n15 and in upstream TF-A bl2_arch_setup() only does this.

13:42 <f_> But I'll see if initialising the system PLL solves anything

13:46 <f_> https://git.vitali64.duckdns.org/misc/trustedfirmware-a.git/tree/drivers/amlogic/ddr?h=wip/gxbb&id=969247f6a22a50aa3b8198c0b1b2cd3108cd1768

13:46 <f_> I still had to import NUMEROUS files to get it to compile at all

13:46 <f_> One of these files did include pll.c, I think it's just for pll_lock_check()

13:47 <f_> https://git.vitali64.duckdns.org/misc/trustedfirmware-a.git/tree/drivers/amlogic/ddr/pll.c?h=wip/gxbb&id=969247f6a22a50aa3b8198c0b1b2cd3108cd1768#n256

13:50 <f_> Either way even if it still didn't work initialising system PLL should help later.

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16:30 <f_> Amlogic really abuses parentheses, for sure!

16:30 <f_> and val << 0 / val >> 0

16:31 <f_> They also abuse tabs!

16:43 <f_> haha

16:43 <f_> pll.c exists in newer U-Boot tree

16:43 <f_> https://github.com/libre-computer-project/libretech-amlogic-boot.git bl33/arch/arm/cpu/armv8/gxl/pll.c

16:45 <f_> So that's not what they wanted to hide by hiding BL2 source code

16:46 <f_> Pretty funny

16:47 <f_> AFAICT they just copied BL2 code and split it into multiple functions

16:47 <f_> (and probably added some more)

16:48 <f_> lol

16:48 <f_> at ddr_pll_test

16:49 <f_> static int ddr_pll_test (void) { return 0; }

16:51 <f_> printf("gxl config irblaster pinmux well\n");

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