How does it compare to the Raspberry Pi 2? In a word: Wow! The Pi 3 boots in 15 seconds, from the time you plug in power until the desktop is ready to use. The Pi 2 takes 30 seconds, the Pi Zero takes 40 seconds and the Pi B+ takes a minute.
I don't know if Pi Zero production was badly planned. Who would know what the demand would be? And production has to be squeezed in between the other Pi made in the same factory. Those lines are running full tilt already. The profit for all involved is a lot less. Maybe it was wise to start small scale and see what happens.
One post : I found that the UART base frequency is not dependent on the cpu-freq but on the core-freq. On the Rspi3 using force_turbo=1 changes the core-freq from 250 to 400Mhz (contrary to the Raspi1 end 2 which keep the core_freq at 250).
Than means the Max Baud has improved from
250/16 = 15.625 Mbd
to
400/16 = 25 MBd
That's good news for the Prop 2, as it should be able to run to 25MBd
SPI speeds are APB/N, so they will become more granular at 400MHz,and will likely hit a pin Slew+delay limit lower than the Max register settings.
Another poster claims "This is an unfortunate side effect of switching the UARTs, as the Bluetooth interface needed the full UART implementation."
Sounds rather like they swapped UARTs, and so broke backward compatible operation ?
Seems they needed to swap because the Bluetooth they use, needs parity ?
(and not all UARTS are equal)
I wonder what else is impacted - FIFO sizes, Baud equations ?
Surely smarter would have been to fix the Bluetooth, and not compromise the Pi ?
Comments
73, Leon
G1HSM
Size on SD card needed to boot, and time to boot.
From Here:
http://www.zdnet.com/article/hands-on-first-evening-with-a-raspberry-pi-3/
We put the new Raspberry Pi 3 through a series of benchmarks and everyday tests to see how it measures up against its predecessor.
http://www.techrepublic.com/article/raspberry-pi-3-how-much-better-is-it-than-the-raspberry-pi-2/
There's a quote here from Eden Upton saying they've just placed a 150,000 piece purchase order for the Zero
https://www.raspberrypi.org/magpi/raspberry-pi-zero-production-getting-on-track/
so hopefully it'll improve their supply issues.
https://www.raspberrypi.org/forums/viewtopic.php?f=72&t=138563
Good & bad news...
One post :
I found that the UART base frequency is not dependent on the cpu-freq but on the core-freq. On the Rspi3 using force_turbo=1 changes the core-freq from 250 to 400Mhz (contrary to the Raspi1 end 2 which keep the core_freq at 250).
Than means the Max Baud has improved from
250/16 = 15.625 Mbd
to
400/16 = 25 MBd
That's good news for the Prop 2, as it should be able to run to 25MBd
SPI speeds are APB/N, so they will become more granular at 400MHz,and will likely hit a pin Slew+delay limit lower than the Max register settings.
Another poster claims
"This is an unfortunate side effect of switching the UARTs, as the Bluetooth interface needed the full UART implementation."
Sounds rather like they swapped UARTs, and so broke backward compatible operation ?
There are a lot of people using the UART who will complain if it does not work as expected. Including me.
Sounds here like this is a change with already many downstream gotchas... (as I suspected)
https://www.raspberrypi.org/forums/viewtopic.php?f=107&t=138223
Seems they needed to swap because the Bluetooth they use, needs parity ?
(and not all UARTS are equal)
I wonder what else is impacted - FIFO sizes, Baud equations ?
Surely smarter would have been to fix the Bluetooth, and not compromise the Pi ?