Just a quick overview of what memory looks like on the Treo 650. Note that there is 32MB of non-volatile storage (the disk-on-chip flash) and 32MB of volatile SDRAM (lost on reset/power down).
Disk-on-chip (“non-volatile” storage)
| 32MB 1 | |
| ROM Partition 2 (anywhere from 7-10MB) |
NVFS Partition (remainder of space) |
RAM (volatile storage)
| 32MB | ||
| Uncompressed ROM 3 (11MB-15MB) |
Dynamic RAM (approx. 5.3MB) |
DBCache (remainder of space) |
Notes
1 In reality this isn’t really 32MB, as 512kB is allocated for the SPL and some of the space may be allocated for bad block reassignment.
2 The ROM partition contains the TPL, SPL, HTC bootloader and the ROM zip.
3 Note that the uncompressed ROM size may exclude alternate languages in any ROMs with a language selection (via the LLid token).
How to roughly calculate DBCache
The formula is pretty easy:
32MB – 5.3MB (dynamic RAM) – Uncompressed ROM size = DBCache
If you have more than one language in your ROM, you can take the uncompressed size of all the files not including the unused language files.
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