Rockbox General > Rockbox General Discussion
iPod video - Disk mode fails, sector size problem. PLEASE help!
torne:
--- Quote from: eltonart on April 12, 2010, 02:09:55 AM ---Does anyone know how to confirm the amount of RAM on a logic-board?
--- End quote ---
If you use the 64MB build and Rockbox crashes when you try and start playing audio, every time, you have only 32MB of ram :)
TexasRockbox:
OK, that's fine. Just confirming the drive so everyone knows what drive that's being discussed. Here's Samsung's specs on the drive: http://www.samsung.com/global/business/hdd/products/downloads/HS12UJQ.pdf
Would it be correct to say 32MB code should work on 64MB hardware but 64MB code would not work on 32MB hardware?
torne:
The drive shouldn't be relevant to the OP's problem; the code in flash can obviously access the disk just fine because it manages to load the Rockbox bootloader from it. It should be able to go into USB mode fine as well, if you hit select+play at the right time, but presumably something is wrong.
eltonart: have you tried letting the battery run all the way down until it won't power on, and then holding select+play while inserting the USB cable to power the player back up? Just a thought...
The 32MB build will work on either logic board, yes; the 64MB build will crash whenever any audio starts buffering (because the memory containing the audio codec is at the end of RAM, as soon as the buffering reaches the ~31MB mark or so it will overwrite the codec and things will go horribly wrong). There was some work to have Rockbox detect the memory size at boot and die with an error if you were using the wrong build, but it's not been committed yet; I'm chasing it up ;)
eltonart:
Hi guys. Firstly, thanks again for your input - I was feeling a bit down about the whole thing but you've given me new motivation to sort this out. Keep up the good work!
Soap:
It might not be related but was concerned that the bootloader could be an issue between the 32Mb and 64Mb boards. If disk mode is accessed via the bootloader in flash ROM then I wondered if this could be related to my problem. I'm not sure I understand your comment about the 256Mb RAM chip because I thought that the 32Mb boards would be physically limited to a 32Mb RAM chip. I will check my old 32Mb board again to try and identify the RAM chip. When I looked through the forums there seemed to be a lot of confusion about that topic. If ONLY apple had made it a different part number. GRRR.
Torne:
I didn't try running it flat but I did try disconnecting the battery. I need to have another play with it and hopefully I'll get my ZIF reader soon. I dont really understand the bootloader but my guess is that the rockbox bootloader is the same as the apple bootloader with a small change pointing to the rockbox build. Is that right or is it something different? That makes sense about the codec, thanks for the info.
soap:
--- Quote from: eltonart on April 13, 2010, 12:10:13 AM ---It might not be related but was concerned that the bootloader could be an issue between the 32Mb and 64Mb boards.
--- End quote ---
Bootloader doesn't care.
--- Quote from: eltonart on April 13, 2010, 12:10:13 AM ---<snip idle speculation>I'm not sure I understand your comment about the 256Mb RAM chip because I thought that the 32Mb boards would be physically limited to a 32Mb RAM chip.
--- End quote ---
256 megabit is 32 megaByte
b = bit
B = byte
--- Quote from: eltonart on April 13, 2010, 12:10:13 AM --- When I looked through the forums there seemed to be a lot of confusion about that topic. If ONLY apple had made it a different part number.
--- End quote ---
I don't think there is much confusion on this issue, and Torne explained it well above.
If in doubt run the 32 build, and he explained what you'd see if you ran a 64 on a 32.
No need to make it more complex than it needs to be.
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