21:20 <ecdhe> NishanthMenon: what's the earlycon CONFIG_ option?

21:20 <ecdhe> Just wanted to make sure it's enabled in my kernel

21:20 <NishanthMenon> ecdhe, which SoC are you on?

21:20 <ecdhe> AM3517

21:21 <NishanthMenon> ouch.. ok

21:21 <ecdhe> hence the 2.6 reference support

21:21 <NishanthMenon> it should 8250 something..

21:21 <ecdhe> CONFIG_EARLYCON? CONFIG_EARLY_CON?

21:22 <NishanthMenon> one sec.. looking..

21:22 <NishanthMenon> CONFIG_SERIAL_8250_OMAP for sure

21:22 <ecdhe> I've got a guess at the U-Boot param, earlycon=uart8250,49020000

21:23 <ecdhe> Okay, I'm gonna do a little grepping and make sure I've got CONFIG_SERIAL_8250_OMAP in my .config

21:23 <NishanthMenon> i think you'd need mmio like i had pointed out.. if I remember right.. boy, i cant even remember how to do omap3 :(

21:23 <NishanthMenon> CONFIG_SERIAL_EARLYCON=y

21:25 <ecdhe> it seems like I probably have both of those enabled

21:26 <ecdhe> I'm going to give it a go and see if I don't see some output

21:28 <NishanthMenon> tmlind, or vigneshr might know better.. but I think something like https://pastebin.ubuntu.com/p/3bwpktJjNK/ is probably the .config, bootargs.. I think you could try something like earlycon=ns16550a,mmio32,0x49020000

21:28 <NishanthMenon> ecdhe, in the morning (US time), might be good to see if tmlind or vigneshr might be around.. to see if they have an idea..

21:29 <NishanthMenon> ecdhe, i clearly remember a discussion on armv7 devices before.. but my mailbox search has failed me..

21:32 <NishanthMenon> oh.. interesting.. https://pastebin.ubuntu.com/24281394/ from j6 .. supposedly just adding earlycon was sufficient in 4.9 kernel timeframe..

21:32 <NishanthMenon> that is the best data I have.. Sorry, a bit dated from 2017.. though..

21:33 <ecdhe> NishanthMenon: no luck so far with earlycon uboot, no output. I thought about jtagging to see what's going on inside after the jump, because I can't 'md' once I jump to the kernel

21:33 <NishanthMenon> ecdhe, hmmm :(

21:34 <ecdhe> NishanthMenon: thanks for your pointers today, I'm guessing earlycon is still really important

21:34 <NishanthMenon> ecdhe, yup.. in k3, that is why i wanted it as default..

21:35 <NishanthMenon> ecdhe, you might want to use pastebin.ubuntu.com for paste.. most of TI network firewalls wont let us go elsewhere (long story)

21:37 <NishanthMenon> paste of a boot log will usually give us a better context of what you are doing.. also btw, once you do a booti, you wont get control back.. u-boot is essentially branched off .. sysrq might work if kernel has reached sane place.. else it is earlycon all the way..

21:37 <NishanthMenon> ofcourse jtag is another way... :)

21:42 <ecdhe> NishanthMenon: thanks, will let you know