On 23-09-04, Sascha Hauer wrote: > 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
Of course but I didn't wanted to step into this hole ;) > 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. Sure, I will add a comment. Regards, Marco > > 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 | >
