06-08-2020, 05:13 PM
Well, you know, Armbian has been doing SBC's for a number of years now
Nearly all SBC have only a uSD slot
They have gotten tired of complaints about their software that turn out to be a crap card
>I have not had any SD card issues, Using various brands, on my : ANSI PBP, ISO PBP, or my Brave Heart phone
Then you have been lucky
There are 2 factors
Speed: is it restricted to 50 mHZ? (slot restricted to ~23MB/s),, OR does card say U1 or U3
pbp sd slot CAN use 1.8V and run at 200 mHz
Writing: run many iozone tests (I have run 40+),,, see how patheticaly poor many cards are (writing, 4k, 16k)
OK if you don't write much or upgrade
And,, BTW, baked into the bootrom, the boot priority is SPI, emmc, SD, usb for program load
Most uboots change that, still read emmc first (if SPI is blank)
Nearly all SBC have only a uSD slot
They have gotten tired of complaints about their software that turn out to be a crap card
>I have not had any SD card issues, Using various brands, on my : ANSI PBP, ISO PBP, or my Brave Heart phone
Then you have been lucky
There are 2 factors
Speed: is it restricted to 50 mHZ? (slot restricted to ~23MB/s),, OR does card say U1 or U3
pbp sd slot CAN use 1.8V and run at 200 mHz
Writing: run many iozone tests (I have run 40+),,, see how patheticaly poor many cards are (writing, 4k, 16k)
OK if you don't write much or upgrade
And,, BTW, baked into the bootrom, the boot priority is SPI, emmc, SD, usb for program load
Most uboots change that, still read emmc first (if SPI is blank)