f_ changed the topic of ##raspberrypi-internals to: The inner workings of the Raspberry Pi (Low level VPU/HW) -- for general queries please visit #raspberrypi -- open firmware: https://librerpi.github.io/ -- VC4 VPU Programmers Manual: https://github.com/hermanhermitage/videocoreiv/wiki -- chat logs: https://libera.irclog.whitequark.org/~h~raspberrypi-internals -- bridged to matrix and discord
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<f_ridge> <c​lever___/D> so, i assume that your emmc clock is 200mhz, so a div of 128 gives 1.56mhz
<f_ridge> <c​lever___/D> ah, but 128 means /256, fixing the data
<f_ridge> <c​lever___/D> your graph is pretty much perfectly linear
<f_ridge> <c​lever___/D> and is transfering about 3.85 bits per clock
<f_ridge> <c​lever___/D> and is transfering about 3.85 bits per clock on average(edited)
<f_ridge> <c​lever___/D> and is transfering about 3.5 to 3.85 bits per clock on average(edited)
<f_ridge> <c​lever___/D> so i can see that your already in 4bit mode, and your not hitting a brick wall like i am, at least for reads
<f_ridge> <x​2x6_/D> So the X axis is the MHz of controller part, right?
<f_ridge> <x​2x6_/D> And Y is mbits per second
<f_ridge> <x​2x6_/D> So if looking at 5 (MHz) we see 20mbits/s meaning that we have 4 bits per clock... something like
<f_ridge> <x​2x6_/D> ok
<f_ridge> <c​lever___/D> ```
<f_ridge> <c​lever___/D> > 6.026324826112757 / 1.5625
<f_ridge> <c​lever___/D> 3.8568478887121644
<f_ridge> <c​lever___/D> > 87.736850362406 / 25
<f_ridge> <c​lever___/D> 3.50947401449624
<f_ridge> <c​lever___/D> ```
<f_ridge> <c​lever___/D> `mbit/mhz` gives bits per clock, on average
<f_ridge> <x​2x6_/D> Ok, I am still on CMD6 problem then)
<f_ridge> <c​lever___/D> yeah, CMD6 and getting it to work at 50mhz
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<juri_> o/
<clever> juri_: *waves*
<juri_> clever: how goes?
<clever> juri_: i managed to get the sd card into 4bit mode, so i can transfer data 4x as fast now