"btrfs as default fs" isn't a clear statement. -- btrfs can only use on HD/SSD/MMC, which is actually used in netbook/desktop/PC like device. -- Currently, mobile phone, etc. doesn't use these but bare flash instead as main persistent storage, so that jffs2/yaffs2/ubifs applies. I think N900 falls in this category. UBIFS seems have most potentials.
These also implies different installation procedure: 1) partition, mkfs.btrfs, copy files ... 2) create jffs2/yaffs2/ubifs image (firmware), download/flash to device BTW, MMC is available in a lot of devices, but it is not qualified to be main storage because of its slow SD interface. Regards, JD Zheng
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