Hi, When upgrading from v5.0 -> v5.1 on G4 PowerBook, I noticed WLAN does not work anymore: [ 42.004303] b43legacy-phy0: Loading firmware version 0x127, patch level 14 (2005-04-18 02:36:27) [ 42.184837] b43legacy-phy0 debug: Chip initialized [ 42.184873] b43legacy-phy0 ERROR: The machine/kernel does not support the required 30-bit DMA mask The same happens with the current mainline. Bisected to: commit 65a21b71f948406201e4f62e41f06513350ca390 Author: Christoph Hellwig <hch@xxxxxx> Date: Wed Feb 13 08:01:26 2019 +0100 powerpc/dma: remove dma_nommu_dma_supported This function is largely identical to the generic version used everywhere else. Replace it with the generic version. Signed-off-by: Christoph Hellwig <hch@xxxxxx> Tested-by: Christian Zigotzky <chzigotzky@xxxxxxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> A.
