On Tue, 2018-05-29 at 13:51 +0200, Andrew Lunn wrote: > On Tue, May 29, 2018 at 06:50:16AM +0100, Jonathan Medhurst wrote: > > On Mon, 2018-05-28 at 18:00 +0200, Andrew Lunn wrote: > > > Hi Rob > > > > > > Since my QNAP only has 512M, there is not too much > > > experimentation i > > > can do. > > > > > > Could you try changing "Memory split" to "3G/1G user/kernel split > > > (for > > > full 1G low memory)". > > > > Don't you mean change it to 2G/2G? That's what would be needed to > > let > > the kernel map the whole 1GB of physical RAM in it's address region > > and > > so not need the high memory mechanism. > > Hi Jonathan > > The comment says: > > config VMSPLIT_3G_OPT > depends on !ARM_LPAE > bool "3G/1G user/kernel split (for full 1G low > memory)" > > So i'm thinking that means it should support up to 1G of RAM using > this split. It puts the split at 0xB0000000, so it is more like > 2.75G/1.25G.
Ah, you are right, I thought you were suggesting VMSPLIT_3G. I didn't notice that the kernel had sprouted an extra VMSPLIT_3G_OPT option a couple of years ago. -- Tixy
