**** BEGIN LOGGING AT Thu Jul 18 02:59:56 2019
Jul 18 12:30:01 <pratimugale[m]> zeekhuge: I made the register changes and the firmware does work properly! here is the changed code: https://gist.github.com/pratimugale/97234a8c0e5346d1dc53b8310264e582. Thanks a lot
Jul 18 12:40:50 <pratimugale[m]> zeekhuge: I'm not clear with what JMP R3.w2 exaclty does though, couldn't find it in any docs. From what I understand, R3.w2 stores the return address of the next instruction of the c-code in the generated .asm file. is this right?
Jul 18 12:42:35 <pratimugale[m]> had to attend college today, so starting now
Jul 18 12:45:43 <pratimugale[m]> <pratimugale[m] "had to attend college today, so "> Tomorrow I will work during the day
Jul 18 12:55:37 <zeekhuge[m]> pratimugale: cool!
Jul 18 12:56:00 <zeekhuge[m]> Now we know how to return from a method that has been implemented in asm.
Jul 18 12:56:03 <zeekhuge[m]> That is so cool
Jul 18 12:56:38 <zeekhuge[m]> So, now we can implement parts of code in asm and call them directly, while other high level code is in C.
Jul 18 12:58:19 <zeekhuge[m]> pratimugale: yes. Thats basically the clpru implementation. You should be able to see in the generated asm code that when we invoke a method, the instruction 'JAL r3.w2, <method label>' is used
Jul 18 12:59:01 <zeekhuge[m]> That 'JAL' instruction unconditionally jumps to the method lable, and also saves the next instruction's address in r3.w2
Jul 18 12:59:08 <pratimugale[m]> <zeekhuge[m] "So, now we can implement parts o"> zeekhuge: yes, will try to call two .asm files from c-program to check if it works too
Jul 18 12:59:34 <zeekhuge[m]> If you will link them correctly, then it will work.
Jul 18 12:59:50 <zeekhuge[m]> Link = using lnkpru
Jul 18 13:01:31 <pratimugale[m]> <zeekhuge[m] "pratimugale: yes. Thats basicall"> Will go through it to see the working
Jul 18 13:01:54 <zeekhuge[m]> Just look in the gist you sent to me
Jul 18 13:02:03 <zeekhuge[m]> What was its link?
Jul 18 13:03:13 <pratimugale[m]> zeekhuge: link as in ?
Jul 18 13:04:02 <zeekhuge[m]> And that halt in the asm code at the end is not required. The code control is anyway jumping before that.
Jul 18 13:04:08 <zeekhuge[m]> So it never gets executed.
Jul 18 13:04:30 <pratimugale[m]> <zeekhuge[m] "And that halt in the asm code at"> Ok
Jul 18 13:04:34 <zeekhuge[m]> Link of the gist which had asm code generated from the C code.
Jul 18 13:05:40 <pratimugale[m]> Oh, here https://gist.github.com/pratimugale/920e3ccec31b6379834434510fa209f0
Jul 18 13:05:46 <zeekhuge[m]> pranav_kumar : hey! How is it going?
Jul 18 13:06:18 <pratimugale[m]> This one was when I was using R1,2,3 registers
Jul 18 13:07:59 <zeekhuge[m]> pratimugale notice the line https://gist.github.com/pratimugale/920e3ccec31b6379834434510fa209f0#file-main_pru0-asm-L216
Jul 18 13:08:08 <pranav_kumar[m]> <zeekhuge[m] "pranav_kumar : hey! How is it go"> Hello @ZeekHuge_:matrix.org  i just came from my college ,i am testing the circuits and update according on the page by today
Jul 18 13:08:36 <pranav_kumar[m]> As i take leave till 22 from the college today
Jul 18 13:09:10 <pranav_kumar[m]> You @ZeekHuge_:matrix.org  get the most of the update by tonight
Jul 18 13:09:15 <zeekhuge[m]> pranav_kumar: okay. Can you please add me to the email threads, if any, that you send out as daily updates?
Jul 18 13:09:49 <pranav_kumar[m]> <zeekhuge[m] "pranav_kumar: okay. Can you plea"> Yes sure
Jul 18 13:10:54 <zeekhuge[m]> pranav_kumar: my email is "contact" at "zeekhuge" dot "me".
Jul 18 13:11:20 <pranav_kumar[m]> I had whatsapp you
Jul 18 13:13:50 <zeekhuge[m]> pratimugale: does that line make it clear now?
Jul 18 13:17:14 <pratimugale[m]> zeekhuge: Yes, so R3.w2 is used everytime a function is called (configIntc function is also present), and since the assmebly code is invoked using the start function, it is our job to jump back to the c-code for it to continue its execution
Jul 18 13:19:04 <pratimugale[m]> in short it is used to return from a function
Jul 18 14:37:18 <zeekhuge[m]> Correct.
Jul 18 16:27:09 <embden[m]> julieng:  it is interesting why there is no output from dom0 after xen output
Jul 18 16:27:23 <embden[m]> are those good bootargs: "rw root=/dev/ram rdinit=/sbin/init console=hvc0 earlyprintk=serial,ttyS2 mem=512M earlycon=xenboot"
Jul 18 18:17:26 <julieng> embden[m]: I am not how Linux would react with both earlyprink and earlycon.
Jul 18 18:17:43 <julieng> If you don't have any output then quite possibly the Dom0 kernel is stuck somewhere
Jul 18 18:17:55 <julieng> before the console (and even earlycon) is enabled.
Jul 18 18:18:31 <julieng> Do you have CONFIG_DEBUG=y selected in Xen? Also, do you have the UART working in Xen (i.e you are able to receive character) ?
Jul 18 18:53:31 <embden[m]> julieng:  yes, CONFIG_DEBUG=y is enabled
Jul 18 18:53:59 <embden[m]> and the same configuration worked earlier, and xen reacts on commands (h, *, ...)
Jul 18 19:39:29 <embden[m]> julieng:  ok, after some experiments I got some output, the right option for me was: "rw root=/dev/ram rdinit=/sbin/init console=hvc0 mem=512M earlycon=xenboot"
Jul 18 19:46:15 <embden[m]> So, now I have a booting kernel https://pastebin.com/f0kXGDEL with almost the same error but with working uart interrupts for xen
Jul 18 19:59:40 <pranav_kumar[m]> zeekhuge:  i had made enough changes so that code become readable and changes all the file type from .p to .asm and remove unwanted spaces
Jul 18 19:59:58 <pranav_kumar[m]> zeekhuge:  look into the branch wip
Jul 18 20:00:07 <pranav_kumar[m]> for latest commits
Jul 18 23:36:13 <pranav_kumar[m]> @ds2 thanks a lot for your suggestions reagarding the circuit modification . And now i can say that every time i run the program it just works fine and no problem is encountered both in input and output. https://youtu.be/Sn4NDfBu9ac
Jul 18 23:37:22 <pranav_kumar[m]> I had removed the logic level shifter from the circuit and running shift register directly from bb black
Jul 18 23:55:00 <pranav_kumar[m]>  zeekhuge  i had sent you the mail plz conform me if you had received that and added you in the email thread
**** ENDING LOGGING AT Fri Jul 19 02:59:57 2019