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h1. PeriPeri-2018-02
http://muistio.tieke.fi/p/periperi-20180202
| Dates | 2018/02/01 - 2018/02/02 |
| Place | see 'Activities' below |
|/12. Member | Geert | 02/02 - 04/02 (night @Home) |
| Jacopo | 28/01 - 05/02 |
| Kieran | 28/01 - 05/02 |
| Laurent | 28/01 - 05/02 |
| -Magnus- |
| Marek |
| -Morimoto- |
| -Ito- |
| Niklas | 28/01 - 05/02 |
| Simon | 02/02 - 04/02 |
| Ulrich | 01/02 - 05/02 |
| Wolfram | 01/02 - 05/02 |
h2. Activities in Brussels
| Date | Time | Activity | Location |
| Monday 2018-01-29 | 09:00 - 18:00 | GMSL Code Camp | Antoine Dansaert 24, 1000 Brussels |
| Tuesday 2018-01-30 | 09:00 - 18:00 | GMSL Code Camp | Antoine Dansaert 24, 1000 Brussels |
| | 19:00 - 21:00 | San Sablon | |
| Wednesday 2018-01-31 | 09:00 - 13:00 | GMSL Code Camp | Antoine Dansaert 24, 1000 Brussels |
| Thursday 2018-02-01 | 14:30 - 18:00 | Multimedia Meeting | Antoine Dansaert 24, 1000 Brussels |
| Thursday 2018-02-01 | 19:00 | Dinner | https://www.bonsoirclara.com/en/ |
| Friday 2018-02-02 | 09:00 - 19:00 | Core, I/O Group, Virtualization BOF? | http://www.hotelbloom.com/ |
| Friday 2018-02-02 | 19:30 | Dinner | http://www.kokob.be/ |
| Saturday 2018-02-03 | 09:30 - 19:00 | FOSDEM | https://fosdem.org/2018/ |
| Sunday 2018-02-04 | 09:00 - 18:00 | FOSDEM | https://fosdem.org/2018/ |
h2. List of material for Multimedia code camp
|Who | What |
|/4. Jacopo | Scope (with probes) |
| Multimeter |
| Network switch |
| Power strip |
|/3. Kieran | Salvator-X H3 + Expansion board |
| 8x RDACM20 |
| 8x RDACM21 |
|/3. Laurent | Kingfisher (including H3SK and MAX9286 add-on boards) |
| Multimeter |
| Power strip |
|/3. Niklas | V3M + Expansion board |
| 8x RDACM20 |
| 8x RDACM21 |
h2. Agenda for Friday Meeting
| 09:00 - 09:30 | Welcome Coffee |
|/2. 09:30 - 10:30 | I/O Group Meeting (incl. future tasks) |
| - i2c mux |
| 10:30 - 11:00 | Coffee Break |
|/3. 11:00 - 12:30 | Core Group Meeting (incl. future tasks) (60') |
| - R-Car Gen2 Watchdog Timer |
| Improving renesas-drivers (30') |
| 12:30 - 13:30 | Lunch |
|/4. 13:30 - 15:30 | Virtualization BoF (120') |
| - Status reports |
| - Issues |
| - Next steps |
| 15:30 - 16:00 | Coffee Break |
|/2. 16:00 - 19:00 | Board Farm, Test automation, Remote access (60') |
| Hacking (Eagle, Draak, ...)? (120') |
h2. Meeting minutes (thanks Kieran!)
h1. I/O Group meeting
h2. RAVB : 2K Header limits
* Niklas has an idea to increase this limit.
* Difference between transmitting and receiving.
h2. SPECTRE
* Wolfram raised that he is Interested in SPECTRE
* 3 Variants of SPECTRE, v2 is the worst - and it's unknown if we can fix it.
* Needs updated kernel (not available for ARM yet) and userspace rebuild.
* Userspace rebuilds (retpoline) may have a performance penalty.
* RMK has reportedly got PoC's which are even more effective at utilising the vulnerabilities.
* Meltdown (PTI) should be an easier fix.
h2. Handling Security Issues in a broad context:
* Laurent raised that a bug in linux-media to read and write kernel memory.
h2. SDHI
* Rasied by Simon in absence
* Next steps for HS400
* Driver and H3/M3-W enablement patches are pending review
* Second upport attempt seemed much easier than first as BSP seems closer to upstream now
* Would like to review other SDHI patches in BSP v3.6.0 with Wolfram, possibly on IRC some time in February
** Yes. WSA, SH to review.
h2. I2C demux
* Raised by Simon in absence
* Understands that consensus from San Sebastian meeting was to accept changes despite OOpses in some subsystems when switching cores. Not entirely happy but willing to accept that consensus.
* Would appreciate a rebast/repost of the dts patches
** Wolfram will repost patches. Ack, thanks!
* Any other issues
h2. MAX9286 GPIO Controller Regulator Loop
* Circular dependency on GPIO regulator for cameras on Eagle-V3M
* MFD is a lot of over head - but it the only 'correct' solution.
h2. IO Group: General Status
* Short meeting style is good for all. (and taken on by other groups)
* Wolfram reprhases summary to make sure he understands it in his own words.
* Wolfram likes Quarterly scheduling of tasks.
* IO tasks agreed by mid-january
** raised externally that this agreement is at least 1 month late however
** high confidence by end of December
h2. I2C Mux
* Can we leave mux channels open to improve performance (reduce 'deselect' calls)
* We can have multiple devices with the same 'default' address, and there must be a negotiation stage to re-configure each address on the child bus
** Currently handled by the device driver
* Should core be more involved in this?
* WSA to think about mux topic :-D
h1. Core Group Meeting
* Status updates round the table
* We're expecting a new Salvator-XS M3-N board potentially sometime in February ?
* Stout board (H2) getting improved support ...
* Can we add elinux-wiki links to cover letters when we send relevant patch sets for additional tasks.
h2. RCar Gen2 Watchdog Timer
* We have a patchset (with 25 patches) from Fabrizio Casteu, and we need to test them.
* Geert to try on Goelsch
* WSA to try on Lager
* Marek to try on Stout.
h2. Future Tasks
* With the upcoming complex Virtualised use cases, adding support for JTAG debuggers would assist in debugging complex issues of the virtualised environments at the core level.
* Function enablement on boards as we get them.
* New platforms share lots of support, and with the shared dtsi infrastructure board bringup should be rapid.
* Expand IPMMU IO Vspace to more than 32 bits (neg)
* Blocked on work from Magnus
h3. Renesas Drivers
* Improving Integration for multimedia
* Magnus would like a central place for latest multimedia work.
* it easier to use especially from a developer's point of view
h3. Goals
* "Renesas-next" but with WIP
* Testing -> Continuous testing
* Shouldn't be a development base
* Doing development on renesas-drivers, means you have to rebase on main before submission.
* Consumption by the BSP
** Releasing a custom kernel -> But we are not a distribution with the resources to test each release.
* Can we have a 'latest topic' branch to continue automatic integration into renesas-drivers
* standardise the feature branches and tag naming scheme
* Dependency handling
* mainline
* subsystem.next
* topic branch
* If you have complex / stale dependencies - then it's fine to leave them out of Renesas-Drivers
h3. Topic naming scheme bikeshedding:
* topic/name-version
* subsystem/next/drivers/feature/
* subsystem/next/core/feature/
* topic/subsystems/?/feature/
* subsystem/topic/?
h3. Preference:
* Still to be considered ...
h3. Update for magnus:
* Standardize on a naming scheme, to define the topic prefix. From there Geert will integrate the latest version based on that prefix.
h1. Virtualisation
h2. QEMU running on an arm64 guest
* Plain QEMU if host is amd64 or arm64
* KVM if host is arm64 (R-CAR H3 or M3-W)
* KVM needs ARM trusted firmware with HYP support
** https://elinux.org/R-Car/Virtualization
h2. Libvirt
* virsh (on amd64, or arm64)
* virt-manager (on amd64)
** https://elinux.org/R-Car/Virtualization/Libvirt
* Provides an abstracted interface common description for multiple virtualisation options.
h3. Virtualisation Status
* Walk trhough of GPIO pass through from Geert
* Configuration of host to enable GPIO passthrough
h3. Guest side (QEMU)
* vfio-platform support not yet supported but patches were posted
h2. Next Steps
* Reset driver, using CPG/MSSR
* Interrupts
* IOMMU groups
h1. Board Farms
* BayLibre ACME is sold out. Can we make or obtain alternatives?
* Prototyping with a Teensy 3.2 (freescale cortex-M4)
* Kit: (Search aliexpress for 'travel router usb')
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