Recent posts

#1

FPGA / Olimex GateMateA1-EVB + Onboar...

Last post by dettus - August 17, 2026, 09:44:15 PM

Hello!

So, I do have an Olimex GateMateA1-EVB.
Currently, I am using the PMOD to attach my design's UART to the outside world.

But I just discovered that there are Pins marked DBG_UART_TX and DBG_UART_RX connected to the RP2040.
Are they accessible through the USB connector?

Currently, I am thinking about a design like this:

Code Select Expand

always @(posedge clk)
begin
    DBG_UART_TX<=DBG_UART_RX;
end
P.S.: I currently do not have physical access to the board, so I am asking, instead of trying.

#2

A20 / Re: T2-OLinuXino-LIME2-IND are...

Last post by LubOlimex - August 17, 2026, 03:39:41 PM

You need micro SD card. You prepare the micro SD card via card reader/writer and personal computer (some laptops have built-in SD card writer). The software to download to the card is free - my recommendation is to start with the base Olimage Linux image. Refer to the Olimage Linux guide for detailed step-by-step instructions:

https://raw.githubusercontent.com/OLIMEX/OLINUXINO/master/DOCUMENTS/OLIMAGE/Olimage-guide.pdf

#3

A20 / T2-OLinuXino-LIME2-IND are thi...

Last post by sasha2002 - August 17, 2026, 02:10:45 PM

Hi
T2-OLinuXino-LIME2-IND are this board without storage?
For what it can be used then?
I've bought it but totally not understand where to flash the OS
Can anyone help?

#4

FPGA / Re: GateMateA1-EVB-2M - use fl...

Last post by LubOlimex - August 17, 2026, 11:21:18 AM

Pretty much, yes.

#5

A20 / Re: difference between A20-OLi...

Last post by LubOlimex - August 17, 2026, 11:18:58 AM

The board will boot without problems without SPI flash! In the case of A20-OLinuXino-LIME2-s16M and A20-OLinuXino-LIME2 - leaving the SPI empty won't cause issues.

The SPI flash is mainly needed when you have eMMC, to facilitate the boot process from eMMC (because the A20 bootloader doesn't support newer eMMCs). Hence we have no eMMC variants without SPI flash. But in the case of A20-OLinuXino-LIME2-s16M there is no eMMC so it is fine!

#6

A20 / Re: LIME2-4GB dead or not?

Last post by philderv - August 17, 2026, 10:45:46 AM

Here is the result,

I used Gnome Disk to write the Olimex Image:
nothing happen - No HDMI Signal

So, I did a an advanced format (is it equal to LLF??) with Gnome Disk.
I'm testing right now the 32 GB SDCard with f3 tool.
It'll take a while I guess.

PS: another thing, I noticed: there was 2 partitions on my SDCard when I used https://sd-card-images.johang.se/boards/olinuxino_lime2.html, one named 'rootfs' and another one I didn't remember the name, but seems to be an EFI partition.
The LIME2 is EFI compatible/capable?

PS: when I flash the Olimex Image with Gnome Disk, there is only one partition (no name, size of image and 10 MB at the start), see screenshot:


So, is there a problem/issue here?

#7

A20 / Re: LIME2-4GB dead or not?

Last post by LubOlimex - August 17, 2026, 10:19:54 AM

Maybe also test with another SD card or maybe validate the one you have with something like f3(fight flash fraud) or H2testW. SD card die often.

By the way also use Balena Etcher or USBImager to prepare the card, since I've had experiences in the past where something wrote some strange bits at the start of a card and preparing it manually without low-level formatting led to failure to boot.

#8

ESP32 / Re: Using High Power Output fo...

Last post by LubOlimex - August 17, 2026, 10:13:43 AM

Use VPP pin at the EXT1 header for 12/24V output from the board - by default when jumper 24V_E1 is open at the VPP pin there is 12V output. If you close 24V_E1 there would be 24V DC.

Notice that the maximums are:

Total output for external circuits – 25W max, max power distributed as follows:

- 0.75A at 24V or 1.5A at 12V (selectable by jumper);
- 1.5A at 5V;
- 1A at 3.3V.

For further reading refer to the manual:

https://github.com/OLIMEX/ESP32-POE2/blob/main/DOCUMENTS/ESP32-POE2-user-manual.pdf

#9

A20 / Re: LIME2-4GB dead or not?

Last post by philderv - August 17, 2026, 10:04:43 AM

Hello LubOlimex,

Thanks for your answer!

I don't add a new post because my post wasn't validated at this time, but here is what I tried too:

- flash this image https://sd-card-images.johang.se/boards/olinuxino_lime2.html on a 32 GB SD Card,
- try to boot it on the Lime 2 (ETH card and USB Keyboard plugged in, HDMI to my screen)
- same thing: no signal with only power LED Red fix,
- try this:
1 - push power button: ETH Led light on one time briefly;
2 - push Reset button: ETH Led light on one time briefly when I released button;
3 - push Recovery button: nothing.

Today, I will reflash the 32 GB SD Card with this image:
https://images.olimex.com/release/a20/ # Debian Bookworm Base
and see what happen.

But I have a few little hope on this matter!

Tchuss! later for news!

#10

A64 / Re: Overheating on mainline Li...

Last post by LubOlimex - August 17, 2026, 09:19:36 AM

Any would do, just get the cheapest even without a pad the heatsink would reduce the temperature significantly. But I'd also test with other governor setting, like performance instead of schedutil:

echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

and check what is the current CPU clock with:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq
cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq

Maybe the CPU speed is too high.