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Paul Webster
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CM4 launched

Mon Oct 19, 2020 7:34 am

https://www.raspberrypi.org/blog/raspbe ... -module-4/

Lots of newness including new form factor.

aBUGSworstnightmare
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Re: CM4 launched

Mon Oct 19, 2020 8:28 am

I LIKE WHAT I SEE!

Looks great, also the optional WIFI interface is highly appreciated as it will ease product development to big extend!

And .. the price of USD35 for the bare IO board is great! But: where to buy it? No seller listed at the time of writing 10:31am CET or they show 'no stock' :cry:

And .. what I only saw on 'second view' - Single +5v PSU input (as the same PMIC as used on the Pi4 seems to be mounted).
Will definitely have to dig into the spec sheet later today ...

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Re: CM4 launched

Mon Oct 19, 2020 9:30 am

It should be available via RS / okdo and Farnell as the normal main distributors.
It is freshly off the production line, so some will be still sorting out stock levels. Rest assured it is in full production and should be available.

For those wanting to know about PCI-e compatibility, I have one here with a Pericom PI7C9X 1 to 3 way PCI-e bridge, and Marvell 9215 4 port SATA card connected to that. (My VL805 USB3 card is still to be delivered). With a couple of extra kernel modules enabled (mainly CONFIG_ATA, and CONFIG_SATA_AHCI) it's the basis of my next NAS.
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Paul Webster
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Re: CM4 launched

Mon Oct 19, 2020 9:42 am

... and I expect that this will lead to more sales of the new IO board (compared to previous) for people who want the extra exposed capabilities of the CM4 compared to the RPi4 but can't make their own.

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HermannSW
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Re: CM4 launched

Mon Oct 19, 2020 9:48 am

Code: Select all

price = (wifi ? 25 : 20) + (ram + ram/4) * 5 + (emmc/8 - emmc/32) * 5
https://static.raspberrypi.org/files/pr ... pdf#page=5
https://stamm-wilbrandt.de/en/Raspberry_camera.html
https://stamm-wilbrandt.de/en#raspcatbot
https://github.com/Hermann-SW/raspiraw
https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://stamm-wilbrandt.de/working_with_FPGAs

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Paul Webster
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Re: CM4 launched

Mon Oct 19, 2020 9:57 am

Is it possible for someone to mistakenly attach the CM4 (e.g. to the CMIO board) the wrong way around?
I ask because it looks like the connectors line up.

dp11
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Re: CM4 launched

Mon Oct 19, 2020 10:06 am

The connectors are offset , so you could get it wrong but it would be obvious as the mounting holes would be very wrong.

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Re: CM4 launched

Mon Oct 19, 2020 10:06 am

It's physically possible, but because the connectors are offset the silk screening on the carrier board should make it obvious. In the case of the CM4 I/O board the module ends up hanging off the edge of the baseboard if misoriented.

nixy82
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Re: CM4 launched

Mon Oct 19, 2020 10:19 am

Hi

Great work guys, really happy to see the CM4 at last. Pats on the back to all who made this happen in such a short time frame!

Have a few questions if you can answer please
  • Are there going to be OrCAD schematics released for the CMIO4 (this was really helpful last time)
  • Are there going to gerbers released for the CMIO4 (this was really helpful last time)
  • Is the CM4 really not capable of sub zero temperature operation?
  • Is there going to be more power supply guidance in line with the CM3 type which gave a figure for the wattage on the +5V rail
Thanks again for the amazing work!

Andrew.

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RaTTuS
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Re: CM4 launched

Mon Oct 19, 2020 10:37 am

Urge to buy rising ,,,,

the new dev board price is just excellent ....
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Re: CM4 launched

Mon Oct 19, 2020 10:38 am

nixy82 wrote:
Mon Oct 19, 2020 10:19 am
Hi

Great work guys, really happy to see the CM4 at last. Pats on the back to all who made this happen in such a short time frame!

Have a few questions if you can answer please
  • Are there going to be OrCAD schematics released for the CMIO4 (this was really helpful last time)
  • Are there going to gerbers released for the CMIO4 (this was really helpful last time)
  • Is the CM4 really not capable of sub zero temperature operation?
  • Is there going to be more power supply guidance in line with the CM3 type which gave a figure for the wattage on the +5V rail
Thanks again for the amazing work!

Andrew.
Kicad is our schematic publishing medium of choice. Available for the IO Board.
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fanoush
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Re: CM4 launched

Mon Oct 19, 2020 10:49 am

RaTTuS wrote:
Mon Oct 19, 2020 10:37 am
Urge to buy rising ,,,,

the new dev board price is just excellent ....
Exactly. Just not sure what Pi4 A can be - if that would have pci-e then it is also an option. But looks like the CM4+IO board is in fact the Pi4 I want :-) Very happy about it. Already have pci-e bridge in the drawer waiting for something like this and also the relatively cheap "Acorn CLE-215+ (Artix 7 FPGA)" pci-e fpga board (~70EUR stuff on ebay - EOLed mining board) is on the way.

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Re: CM4 launched

Mon Oct 19, 2020 10:59 am


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Gavinmc42
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Re: CM4 launched

Mon Oct 19, 2020 11:03 am

Great, I just finished laying out a motherboard for a Pi4 :oops:
It was for prototyping.
Guess what I will be using for production :D

The Kicad files will be handy.
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cleverca22
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Re: CM4 launched

Mon Oct 19, 2020 11:35 am

my only real complaint upon a quick glance, is that the ethernet PHY is on the CM4 board

if the PHY was on the CMIO4 instead, then the end-user would have the choice between getting another 12 gpio pins, or gigabit ethernet, and they could choose their own PHY
there are also switch IC's with RGMII, so you can skip the PHY directly, which would have let you make a CM4 based router


seperately from that, a question on documentation, i notice that it doesnt explain about how the HDMI lanes can be swapped

https://github.com/raspberrypi/linux/bl ... #L476-L484

basically, the PHY lets you swap the 4 lanes of the hdmi around, and the RPI4B has some lanes miswired slightly (likely to make routing simpler)

do the docs for the CM4 then mis-label the lanes, to match up with what the linux driver is expecting?

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Re: CM4 launched

Mon Oct 19, 2020 11:40 am

Is it possible to add the PCIe with either M2 SATA/nvme adaptors) to the boot order?
Just curious.

cleverca22
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Re: CM4 launched

Mon Oct 19, 2020 11:43 am

bensimmo wrote:
Mon Oct 19, 2020 11:40 am
Is it possible to add the PCIe with either M2 SATA/nvme adaptors) to the boot order?
Just curious.
that would require drastic changes to the bootcode.bin in the eeprom, which i'm not sure the pi foundation would be up for, along with the issues of which sata driver to use

it would be simpler to get the CM4 with 8gig of flash, dedicated that to /boot, and then put / on your sata drive

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bomblord
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Re: CM4 launched

Mon Oct 19, 2020 12:14 pm

Pci 1x slot? Could you theoretically add a graphics card into this thing with a proper power setup???

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piglet
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Re: CM4 launched

Mon Oct 19, 2020 12:19 pm

bensimmo wrote:
Mon Oct 19, 2020 11:40 am
Is it possible to add the PCIe with either M2 SATA/nvme adaptors) to the boot order?
Just curious.
I'd really like to boot from M.2 on CM-lite.

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Re: CM4 launched

Mon Oct 19, 2020 12:29 pm

We've got NVME booting support on the list of things to do, but behind a couple of other things.

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Re: CM4 launched

Mon Oct 19, 2020 12:52 pm

bomblord wrote:
Mon Oct 19, 2020 12:14 pm
Pci 1x slot? Could you theoretically add a graphics card into this thing with a proper power setup???
IIRC last time someone tried that (on a hacked up pi4 board) it didn't work because the controller was unable to deal with the large address space demands of a modern graphics card.

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Re: CM4 launched

Mon Oct 19, 2020 1:02 pm

Comparing the datasheets for the CM3+ and CM4 it seems we have lost the "bank 1" GPIO, is that correct?

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Re: CM4 launched

Mon Oct 19, 2020 1:20 pm

Minor correction :

In https://www.raspberrypi.org/products/co ... tenna-kit/ it is stated:
Obsolescence Statement

Compute Module 4 Antenna Kit will remain in production until at least January 2020
January 2020 ?
Probably meant : January 2028

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bomblord
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Re: CM4 launched

Mon Oct 19, 2020 1:30 pm

plugwash wrote:
Mon Oct 19, 2020 12:52 pm
bomblord wrote:
Mon Oct 19, 2020 12:14 pm
Pci 1x slot? Could you theoretically add a graphics card into this thing with a proper power setup???
IIRC last time someone tried that (on a hacked up pi4 board) it didn't work because the controller was unable to deal with the large address space demands of a modern graphics card.
Hmm I wonder if any of the OS updates/hardware changes in the computer module could have inadvertently fixed that. I mean to even address the PCIE port it has to meet a certain set of minimum requirements.

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piglet
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Re: CM4 launched

Mon Oct 19, 2020 1:34 pm

gsh wrote:
Mon Oct 19, 2020 12:29 pm
We've got NVME booting support on the list of things to do, but behind a couple of other things.

Gordon
Great news. Thank you Gordon.

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