Pine64 storage

[baylf2000]

answer me proof sd card speed !  Please !

Nice, you seem to be the average Pine64 kickstarter backer trusting in specs and promises more than in reality 

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Getting anything greater than about 25MB/s from an SD card

I would suspect it's more close to 20/22MB/s (write/read) as with any other Allwinner SoC now.

Exactly. But it's not just Allwinner. The SD card specs say clearly that the maximum theoretical speed for the SD bus itself is 25MB/s. The only way to improve on that is to upgrade the bus to UHS, which requires specialised voltages in the case of UHS I, and extra data lines in the case of UHS II.

I have never seen an ARM soc board implement a UHS interface. I have no idea why. I wish I knew. It's not rocket science. I'm not it might be because of licensing costs for UHS interfaces, but no manufacturer has ever confirmed this to me.

For our rude Chinese friend, here is the official interface specs from the SD Association themselves. https://www.sdcard.org/developers/overvi...index.html

Can you Stop ?

I have no time to here read your English .  This is over 25MB/s , you asked is SD 2.0 version




Please read allwinner A64 document 

https://drive.google.com/file/d/0B0cEs0l...ef=2&pli=1

Why are you so RUDE? WHO ARE YOU?? If you have no time to read English, why are you here??? You obviously have no idea what you're talking about, so GET LOST!

You are also VERY WRONG. You are confusing the bus interface with the protocol. Two completely different things.

Yes, the processor claims to support UHC, yet there is only a single mention of it in the entire 700+ page "user manual", so I doubt whether it's true. And even if it were true, it requires special implementation both electrically on the board, and within the drivers/firmware. Unless the creators have specifically written a UHS driver, then it WILL NOT WORK AS A UHC interface, and therefore, IT WILL BE LIMITED TO A MAXIMUM OF 25MB/s.

[hlide]

    ...

[joe]

answer me proof sd card speed !  Please !

Nice, you seem to be the average Pine64 kickstarter backer trusting in specs and promises more than in reality 

---

Getting anything greater than about 25MB/s from an SD card

I would suspect it's more close to 20/22MB/s (write/read) as with any other Allwinner SoC now.

Exactly. But it's not just Allwinner. The SD card specs say clearly that the maximum theoretical speed for the SD bus itself is 25MB/s. The only way to improve on that is to upgrade the bus to UHS, which requires specialised voltages in the case of UHS I, and extra data lines in the case of UHS II.

I have never seen an ARM soc board implement a UHS interface. I have no idea why. I wish I knew. It's not rocket science. I'm not it might be because of licensing costs for UHS interfaces, but no manufacturer has ever confirmed this to me.

For our rude Chinese friend, here is the official interface specs from the SD Association themselves. https://www.sdcard.org/developers/overvi...index.html

Can you Stop ?

I have no time to here read your English .  This is over 25MB/s , you asked is SD 2.0 version




Please read allwinner A64 document 

https://drive.google.com/file/d/0B0cEs0l...ef=2&pli=1

Why are you so RUDE? WHO ARE YOU?? If you have no time to read English, why are you here??? You obviously have no idea what you're talking about, so GET LOST!

You are also VERY WRONG. You are confusing the bus interface with the protocol. Two completely different things.

Yes, the processor claims to support UHC, yet there is only a single mention of it in the entire 700+ page "user manual", so I doubt whether it's true. And even if it were true, it requires special implementation both electrically on the board, and within the drivers/firmware. Unless the creators have specifically written a UHS driver, then it WILL NOT WORK AS A UHC interface, and therefore, IT WILL BE LIMITED TO A MAXIMUM OF 25MB/s.

I don't want to you argue , i just want play this toy .
about your sd speed i don't know , i just read the allwinner document . 
and i am not read 700 page , you open this PDF file Ctrl + F search ( Sd ) only press 4 times can find it 441 PAGE .

[monmoonmooonmoooon]

@@tllim

Can you enlight us please?

What will be the true speeds for SDCards? For example a support a Class 10 UHS-I in full speeds?

[joe]

@@tllim

Can you enlight us please?

What will be the true speeds for SDCards? For example a support a Class 10 UHS-I in full speeds?

I belive he very busy this project , Gave him time !

[monmoonmooonmoooon]

@@tllim

Can you enlight us please?

What will be the true speeds for SDCards? For example a support a Class 10 UHS-I in full speeds?

I belive he very busy this project , Gave him time !

I just ask him to stop useless threads...

[tllim]

@@tllim

Can you enlight us please?

What will be the true speeds for SDCards? For example a support a Class 10 UHS-I in full speeds?

I have not fully try out the SD Cards speed. I knows that the A64 can handles SDXC and per datasheet, it accepts UHS command set. There are only few ARM SoC chips in market that support SDXC. From reading the A64 datasheet, my guess is A64 may able up to 50MB/s, but not 104MB/s which required lower 1.8v SD card. However, my assumption can be dead wrong. Once somebody bring up the Linux build, we can try out.

[baylf2000]

@@tllim

Can you enlight us please?

What will be the true speeds for SDCards? For example a support a Class 10 UHS-I in full speeds?

I have not fully try out the SD Cards speed. I knows that the A64 can handles SDXC and per datasheet, it accepts UHS command set. There are only few ARM SoC chips in market that support SDXC. From reading the A64 datasheet, my guess is A64 may able up to 50MB/s, but not 104MB/s which required lower 1.8v SD card. However, my assumption can be dead wrong. Once somebody bring up the Linux build, we can try out.

SDXC is a card standard, and has nothing to do with the interface. The ONLY way for ANY kernel, be it Linux or Android, to get beyond 25MB/s is to implement UHS, and this requires several things. A post by the makers of Rasperry Pi in their forums explains this is more detail.

"The Pi uses SD High-speed mode (SDR50) at 25MB/s - the option to use SDR104 or DDR50 exists but is not tested.


There are additional constraints on using these modes: the VDDIO voltage must be switched at runtime between 3.3V and 1.8V and the delay between card and host has to be tuned via a tuning register to match the PCB layout/card delay etc. 

Even if you had a voltage switch available for the bank voltage select (Pi is hardwired to 3v3 for SD spec, compute module is wired to 1v8 for eMMC spec) I believe the kernel SDHCI driver currently does not implement this functionality therefore SDR104/DDR50 don't work. That and the hardware's not been tested at that speed - which is pushing it as far as the GPIO pad drivers can go - so the chances of success, even if you could hack the hardware to select the voltage, are slim."

[Galileo]

the VDDIO voltage must be switched at runtime between 3.3V and 1.8V and the delay between card and host has to be tuned via a tuning register to match the PCB layout/card delay etc. 

That's interesting. I guess this question here for this other A64 board is related? https://olimex.wordpress.com/2016/01/08/...ment-21223