Model A/B SD cross compatibility

[PhilS]

Hi all,

Just a thought, will an SD card that has been used in a model B run in a model A and vice versa? I've had issues with kernels being compiled for specific memory sizes and locations, so I thought I'd check!

(Sorry if it"s been asked before)

Cheers

[jamesh]

PhilS said:


Hi all,

Just a thought, will an SD card that has been used in a model B run in a model A and vice versa? I've had issues with kernels being compiled for specific memory sizes and locations, so I thought I'd check!

(Sorry if it"s been asked before)

Cheers


An interesting question. I don't know! The Linux kernel side should be fine, but I am not sure what happens on GPU boot, where it decides the memory allocations for Linux.

I'll try and find out.

[PhilS]

Thanks, if nothing else, I'm sure we'll find out pretty soon!

[mobeyduck]

I think from A to B shouldn't be a problem you might be unable to use the Ethernet but that can be fixed. Adding memory should never be a problem.

(excluding some (old)dedicated stuff)

B to A can get a memory problem

[patrickhwood]

My guess is that the same kernel will run on both boards.  This has certainly been the case with other ARM-based boards with multiple memory configurations.

If that's not the case, then you can wait for a uboot port, then use that to chain load the kernel, passing appropriate arguments for memory and driver configuration.

[jamesh]

Pat said:


My guess is that the same kernel will run on both boards.  This has certainly been the case with other ARM-based boards with multiple memory configurations.

If that's not the case, then you can wait for a uboot port, then use that to chain load the kernel, passing appropriate arguments for memory and driver configuration.


That is the case - the reason I wasn't sure earlier was I think the memory partition is done at boot and I am not sure how it decides on this.