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kvemkon

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Ada and Spark on ARM Cortex-M – A Tutorial with Arduino and Nucleo Examples 4 months ago

i.MX8 is not realtime and the support for running bare metal code is very much non existent.

Looking at e.g. STM32H755: 1x Cortex-M7 480 MHz, 1x Cortex-M4 240 MHz, USB2, 100 Mbit Ethernet, DAC.

Comparing to AM6421: 1x Cortex-A53 1GHz, 2x Cortex-R5F 800MHz, 1x Cortex-M4F 400MHz, 2x PRU, USB3, 1 Gbit Ethernet, PCIe Gen2.

I can hardly believe STM32H755 microcontroller is almost so costly as AM6421 SoC.

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DDR4 Sdram – Initialization, Training and Calibration 4 months ago

environmental conditions

Shouldn't it be: no more negligible manufacturing / assembly tolerances instead? I mean, when I turn PC on, the temperature of all components is 20 C, the training is done at almost this temperature. But then the PC can work for months with much more higher memory controller and DRAM chips temperatures.

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CXMT has been offering DDR4 chips at about half the prevailing market rate 5 months ago

add more channels

and unfortunately increase latency even more with registered DIMMs. Comparing bandwidth increase (50 GB/s) to the stagnated latency (~80..120 ns total, less than ~0.1 GB/s) over last decades, I'm wondering, whether one still can call today's RAM random memory (though sure it can be accessed randomly). Similar to hard disk drives. Up to 300 MB/s sequentially but only up to less than 1 MB/s 4KB random (read).

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Notepad++ hijacked by state-sponsored actors 6 months ago

You can totally say ...

"Say" in the sense of demonstrate peacefully for this? Then I'm impressed. If someone else can confirm this? Is this because of USA being a federal union? Before Ukraine declared independence, there were voices to make Ukraine a federal state, so that people in the West part of Ukraine can live their way of life and people living 1600 km (!) away in the East and Southern parts would be not much affected from that and vice versa. Voices for the unitary state were stronger because of stability of the state. Would be interesting to see some documentary "what if", whether a federal state would be more stable against pulling from the west (Europe, US) and the east (Russia).

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Notepad++ hijacked by state-sponsored actors 6 months ago

I'm referring to (if we would continue with the list):

- Ukraine for Donbas

Which is so much weaker than all others. There are Ukrainians, Russians, Chinese, Tibetans. But there is no such ethnicity as People of Donbas.

OTOH in a democratic state you're still have the right to demonstrate peacefully for whatever you want, even if it doesn't make much sense. But would you allowed to demonstrate in Ukraine for Donbas independence if they are considered separatists according to the law?

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A tab hoarder's journey to sanity 7 months ago

about 15 seconds for the browser to launch

I also have many tabs (that's why I could quickly recall and find the post). Restoring session takes a while (much more than 15 seconds). I measure this time by looking on the CPU consumption. Only once it drops to near zero I consider session completely restored.

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I/O is no longer the bottleneck? (2022) 7 months ago

CPU is limited by its memory bandwidth for streaming tasks

That must be the reason, why EPYC 9175F exists. It is only 16-core CPU, but all 16 8-core CCDs are populated and only one core on each is active.

The next gen EPYC is rumored to have 16 instead of 12 memory channels (which were 8 only 4-5 years ago).

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