| 16:52 | edge0701 | Heyyup all (: |
| 19:51 | topi` | very idle here, it seems |
| 19:51 | topi` | I need to know which UARTs do I have usable on the HB-Gate? |
| 19:51 | topi` | the console UART can, of course, also appropriated if I give up on the console |
| 19:52 | topi` | "Hummingboard 2" is a broken link in the Solidrun wiki :( |
| 19:57 | topi` | there is a "RS485 or UART 3 pin header" .. can this be used for RS232 UART? |
| 19:57 | jnettlet | topi`, I will double check the pins but I think only 2. |
| 19:57 | topi` | physical header J35 |
| 19:57 | jnettlet | That header is the default serial console uart |
| 19:58 | topi` | oh |
| 19:58 | topi` | what about using the UART lines on the mikrobus connector? |
| 19:58 | jnettlet | Sure that is what they are for |
| 19:58 | topi` | there is UART3_TX_DATA and RX |
| 19:59 | topi` | ok, are they visible to the kernel by default? |
| 19:59 | jnettlet | The mikrobus is just a standard for pin placement and size |
| 19:59 | topi` | yeah |
| 19:59 | jnettlet | Still working on that... But soon |
| 20:00 | topi` | but this UART3 comes from the i.MX6 internal uarts, right? |
| 20:00 | jnettlet | well they all come from the SOC. |
| 20:01 | jnettlet | One UART is not exposed on the board because it is reserved for the onboard BT |
| 20:02 | jnettlet | I would need to reference the pins to figure out what the last UART pins are. They may just need to be remuxed |
| 20:10 | topi` | right |
| 20:10 | topi` | but that would be needed aswell when using the mikroBUS's uarts |
| 20:10 | topi` | or rather, the single uart |
| 20:10 | topi` | and many mikrobus click boards use the uart pins, specifically :) |
| 20:16 | jnettlet | How many uarts do you need? |
| 20:29 | edge0701 | Anyone know much about SPL boot?? Looking to boot Linux kernel direct from SPL...I'm close, but no cigar |
| 20:29 | topi` | jnettlet: 2, one for console and one for connecting to another gadget |
| 20:30 | topi` | edge0701: good luck setting things up correctly (like clocls, sdram,devicetree etc) |
| 20:32 | jnettlet | edge0701, it already works with my uboot |
| 20:32 | edge0701 | Well, uboot SPL seems to be set up pretty well. |
| 20:32 | edge0701 | I am using u-boot SPL but with OS_BOOT |
| 20:33 | edge0701 | I have to return 0 from spl_start_uboot because I don't know how I'm meant to set SNVS?? |
| 20:33 | jnettlet | Is the first partition of your boot drive a fat partition? |
| 20:33 | edge0701 | Anyway, it gets to image load point. It has loaded kernel and device tree from fat, into the same memory addresses as u-boot uses. |
| 20:34 | edge0701 | The SPL code does some kind of device tree "patching" - I'm not fully sure of what that all does |
| 20:34 | edge0701 | So I am just trying to do memory dumps from SPL boot and u-boot and compare. |
| 20:34 | jnettlet | lol...it just patches in the memory size |
| 20:34 | jnettlet | it is very simple. |
| 20:35 | edge0701 | Well I see that, then some stuff about cells... |
| 20:35 | edge0701 | I didn't delve further into that bit |
| 20:35 | jnettlet | that is just for the parsing |
| 20:36 | edge0701 | Right. |
| 20:36 | jnettlet | To do fast booting you need 4 things. SPL, first partition of the SDHC is fat, zImage and dtbs on that partition, with the dtbs patched for any kernel commandline options you need |
| 20:37 | jnettlet | and lastly you need to set the fastboot code in the persistent register |
| 20:37 | jnettlet | do you have devmem or devmem2 installed on your image? |
| 20:37 | edge0701 | That is SVNS 0x68, correct? |
| 20:37 | edge0701 | It's buildroot...not seen it, but sure it'll be there. |
| 20:38 | edge0701 | I wonder if u-boot still passes atags and the device tree command line options aren't the same.. |
| 20:39 | jnettlet | You need to install devmem or devmem2 and run devmem 0x20cc068 16 0x100 or devmem2 0x20cc068 h 0x100 |
| 20:39 | jnettlet | it does not pass atags which is why I parse the device-tree to give the kernel all the info it needs |
| 20:40 | jnettlet | if you need additional kernel commandline options you need to patch the device-tree files with those options |
| 20:40 | jnettlet | I still need to push my patch that exposes that to userspace via sysfs |
| 20:42 | jnettlet | the process is SPL -> read fast boot register -> attempt to read fat partition -> look for zImage and dtb -> parse dtb with needed info -> execute kernel |
| 20:42 | jnettlet | SPL includes, initial driver bringup and initializing DDR |
| 20:43 | jnettlet | edge0701, does that answer all your questions? |
| 20:43 | edge0701 | Right. So if u-boot boots the kernel with device tree fine, then SPL should boot fine, too, right? |
| 20:43 | edge0701 | Everything was the same except rootwait... |
| 20:43 | edge0701 | Just about to try again |
| 20:45 | edge0701 | (Same as my uboot bootargs, that is) |
| 20:49 | jnettlet | topi`, uart4 is not available. it is used for the csi0 connector |
| 20:50 | jnettlet | I guess in theory you could steal those pins from that connector if you really had to and don't need a camera |
| 20:55 | topi` | we also got some RS485 +5V clickboards, how do I talk to them if there are no uarts available? |
| 21:04 | edge0701 | No luck. I've followed the process through and it all works as it should do (as far as I can tell). But the kernel just doens't do a thing. |
| 21:04 | edge0701 | p.s. I assume you are Jon? http://forum.solid-run.com/viewtopic.php?f=10&t=2776&sid=ebcc49d8ac75c647e910c12a58fe144d |
| 21:05 | jnettlet | Well there is the UART on the clickboard available. You just need device tree entries for it |
| 21:07 | topi` | ok. do you have any examples? maybe create a "dt-examples" repo on github :) |
| 21:13 | edge0701 | I am using the latest Solidrun u-boot from github, btw. I assume this is what I should be using. And latest kernel from Solidrun, too 3.14.14. |
| 21:13 | jnettlet | Just sitting down for dinner and a movie. Can you guys catch me tomorrow? |
| 21:14 | edge0701 | Sure. Thanks for the pointers this evening. Have a good one. |
| 21:14 | topi` | jnettlet: that sounds much better :) I also should be taking care of the family |
| 21:15 | jnettlet | edge0701, please use the linux-fslc kernel |
| 21:15 | jnettlet | Ttyl then. Have a good evening |
| 21:15 | topi` | edge0701: https://github.com/SolidRun/linux-fslc |
| 21:16 | topi` | this is the current kernel |
| 21:22 | edge0701 | Right. Thanks for that. My bad on that one. |