Hi Marco, On Thu, Aug 31, 2023 at 04:47:24PM +0200, Marco Felsch wrote: > At the moment the whole available memory is added to one single memory > bank "ram0". This can cause barebox chainload issues on devices with a > huge amount of memory like the i.MX8MP-EVK which has 6G of RAM if the > barebox pbl binary is to large. > > The reason for this issues is that memory_bank_first_find_space() > returns the memory area with the largest amount of free space on the > first memory bank. So in case of Debix SOM-A 8G and i.MX8MP-EVK 6G this > is the area crossing the 4G boundary. This cause the barebox pbl code to > trigger a MMU exception once the early MMU gets enabled which is > configured for sizes <=4G. > > Split the memory space into two memory banks: "ram0" and "ram1" to fix > this issue. In the long run we'll need a proper solution for this. I think this patch is fine for now, but please add a comment why we are doing this. Otherwise we might remove this superfluous code at some point. Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
