Device trees as ABI -- flag the stable ones

Posted Aug 2, 2013 8:58 UTC (Fri) by rvfh (guest, #31018)
In reply to: Device trees as ABI -- flag the stable ones by etienne
Parent article: Device trees as ABI

> Once U-boot can access DDR ram and FLASH, it has basically finished its job and just loads two files in memory (linux kernel and DT) without looking at their content.

OK. On TI OMAPs we have U-Boot/SPL initialising the DDR ans SD card, so U-Boot is directly loaded into it (and the DT could be too.) To some extent, this means the DT info is partly duplicated into U-Boot/SPL.

> In the embedded world there is no well-know addresses, but there is no place to store such a database neither.

Yes, and anyway, there is not necessary a way to determine the board type (and thus choose the correct DT), so the board type is likely hard-coded into the boot loader.

But that's OK to me: it's the SoC case. It remains IMO that in the PC case a DT can be in the /boot partition because we can get there thanks to BIOS/standards/...