| 06:17 | jnettlet[m]> | So the startech expansion card works well in the 8040 board. It seems like the nvme slot has 2x PCI lanes, and the other 2 lanes are used 1 each for the additional sata ports. which is not bad, my samsung 960 EVO gets about 1.3-1.4GB/s seq read. |
| 06:17 | jnettlet[m]> | I haven't profiled it yet to see where the bottlenecks are. |
| 11:02 | topi`_> | jnettlet[m]: somebody said on #linaro that the pcie on macchiatobin is somehow broken |
| 11:02 | topi`_> | but obviously it works for you since the startech card must be using x4 signals? |
| 11:02 | rabeeh> | i think there is an issue when using GPUs |
| 11:02 | topi`_> | how come it doesn't affect NVMe boards then? |
| 11:03 | jnettlet[m]> | to use a GPU you need to use uefi not u-boot |
| 11:03 | topi`_> | yes, most probably |
| 11:03 | jnettlet[m]> | my NVME signal is only using x2, and then 2 x1 for sata ports |
| 11:03 | topi`_> | but then again, it's not a macchiatobin specific problem ;) |
| 11:03 | rabeeh> | the reset signal is not held low on power up; so this confuses part of the GPUs; the workaround that we suggest for Marvell (for now) is to add a pull down resistor on the reset signal and it solved the issue for them. |
| 11:04 | topi`_> | can I try to add such a pulldown myself? |
| 11:04 | topi`_> | probably at least 10K ohms needed |
| 11:04 | rabeeh> | yes |
| 11:04 | rabeeh> | i can send you a picture where to deploy |
| 11:05 | topi`_> | I probably don't have time for that now, since gotta work on the HB :) |
| 11:05 | topi`_> | which brings me to the point... jnettlet: do you have any "new" patches for mainline for imx6? |
| 11:05 | topi`_> | I'm using some patchset that you sent me in April |
| 11:05 | topi`_> | for 4.9.21 |
| 11:07 | jnettlet[m]> | topi`_: no. mainline wants me to actually minimize my patches for our boards. We have too many variants. So full board support will actually be using u-boot with fdt overlays to support all the boards fully. |
| 11:08 | topi`_> | 4.9 LTS seems to have received a lot of patchlevels, now it is at 4.9.39 |
| 11:09 | jnettlet[m]> | yep, lots of churn |
| 11:09 | topi`_> | we try to keep patching the deployed systems remotely so that the worst kernel exploits get patches :) |
| 11:10 | topi`_> | I'll try to rebase my custom patchset on top of that 4.9.39 |
| 11:11 | topi`_> | I think the next thing I'll test the HB is using it as an accesspoint (base station) |
| 11:11 | topi`_> | the Wilink seems to be rather decent |
| 11:11 | topi`_> | I had lots of problems on the older HB> with the broadcom wifi |
| 11:11 | topi`_> | it would die after a while of transferring photos etc |
| 11:11 | topi`_> | would only recover after systemctl stop hostapd && systemctl start hostapd |
| 11:14 | jnettlet[m]> | yes the wilink8 is much better. |
| 12:36 | topi`_> | rabeeh: any hints for enabling PWM for the macchiatobin fan? |
| 12:36 | topi`_> | I've enabled PWM on some OMAP3 chip in historical times, it wasn't that hard... |
| 12:36 | topi`_> | but that was for a LED |
| 12:53 | rabeeh> | the GPIO is CP0_MPP43 |
| 12:53 | rabeeh> | the GPIO is CP0_MPP48 |
| 12:53 | rabeeh> | it drives a buffer that drives the fan's pwm line |
| 12:54 | topi`_> | hmm, maybe I can try that semi-manually |
| 12:54 | topi`_> | can that gpio be controlled via /sys/class/gpio interface? |
| 12:54 | rabeeh> | i assume that you don't have specs; right? |
| 12:54 | topi`_> | yeah I'm working on the HB, not the macchiato ;) |
| 12:54 | topi`_> | but it'd be nice to reduce the fan noise of the latter |
| 12:55 | rabeeh> | i have a 7 CFM fan connected to it |
| 12:56 | rabeeh> | basic fan that blows minor air to it |
| 12:56 | rabeeh> | the temperature rise with the big heatsink is ~20c |
| 12:56 | rabeeh> | that's when running cpuburn on the 4 processors at 2GHz |
| 12:56 | topi`_> | are there different heatsinks? mine came fitted with a heatsink with 2 cm cylindrical fins |
| 12:57 | rabeeh> | silver finish? |
| 12:57 | rabeeh> | i.e. you see the aluminium color? (i.e. not black)? |
| 12:57 | topi`_> | yeah alu |
| 12:57 | rabeeh> | yeah; so that's the bigger heatsink that we have today |
| 12:58 | topi`_> | it still gets hot... if I compile linux with all cores, it at some point resets the board |
| 12:58 | topi`_> | the temp reading goes to 93C and above |
| 12:58 | topi`_> | this was at the 1.3 ghz core setting |
| 12:58 | topi`_> | 2.0 ghz runs the cores somewhat hotter still |
| 12:59 | topi`_> | where can I get the right gpio number from linux's point of view? |
| 12:59 | topi`_> | the GPIO pin <-> linux_gpio mapping was somewhat easy to find in the Hummingboard docs |
| 12:59 | topi`_> | but here... |
| 13:06 | jnettlet[m]> | topi`_: I am not sure if the 8040 pwm's work the same as the other armada devices. If so then pwm is just a property of the gpios...basically it has a blink setting in the hardware. |
| 13:08 | topi`_> | oh? |
| 13:08 | topi`_> | never heard of that |
| 13:10 | jnettlet[m]> | here is the armada support. https://lwn.net/Articles/718211/ |
| 13:12 | jnettlet[m]> | the 8040 uses the same gpio driver, so there is a good chance that it does pwm the same |
| 13:16 | topi`_> | hmm, too much work, maybe I'll just buy a quiet fan for this .D |
| 13:16 | topi`_> | .D |
| 13:16 | topi`_> | wife expects me to come home |
| 13:17 | topi`_> | this is the kind of work Marvell should be doing! |