Is the RPI SD card clocking speed established at startup?

Hi,

My RPI crashes after a while....

1. Is the SD card clock speed "discovered" by RPI at start up by it trying to find the fastest clock which works or is this speed fixed?

2. Does the working maximum clock rate for an SD card drop as it warms up?

3. I note that cooling the RPI SD card but not the RPI from a crashed RPI with freezer spray seems to make it much more likely the RPI will reboot successfully.

Thanks,

Nick

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GreenYamo over 13 years ago

Hello Nick, that crashing sounds like it could be a power problem, rather than something to do with the SD card ? What is the spcfication of the charger you are using ?

Some of the early Pi's seem to be sensitive to heat as well, my first Pi needs power removed and a good rest before it will boot back up again (although doesn't crash), the second, later model is fine with all peripherals being the same as for the first.

Also check that your SD card is on the working list:http://elinux.org/RPi_VerifiedPeripherals#SD_cards
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GreenYamo over 13 years ago

Hello Nick, that crashing sounds like it could be a power problem, rather than something to do with the SD card ? What is the spcfication of the charger you are using ?

Some of the early Pi's seem to be sensitive to heat as well, my first Pi needs power removed and a good rest before it will boot back up again (although doesn't crash), the second, later model is fine with all peripherals being the same as for the first.

Also check that your SD card is on the working list:http://elinux.org/RPi_VerifiedPeripherals#SD_cards
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