Hyperion Entertainment Message Boards

Posted: **Fri Nov 29, 2019 6:54 pm**

Skateman wrote:Kernel 5.5 Alpha3 up and running on the AmigaOne X5000

Hi Skateman,

Many thanks for testing the alpha3!

Cheers,
Christian

Posted: **Mon Dec 02, 2019 12:03 pm**

Hi All,

I released the alpha4 of kernel 5.5 for the X1000 and X5000 today.

New:

PowerPC updates 5.5-1
X5000/20 and X5000/40: cyrus_5.5-2.patch
X5000/20 and X5000/40: coherent_cache-v2.patch
X5000/20 and X5000/40: mem-v3.patch
Linux Git log
Phoronix articles, reviews and news stories covering Linux 5.5

Download: linux-image-5.5-alpha4-X1000_X5000.tar.gz

I successfully tested the alpha4 of kernel 5.5 with Fienix PPC32, ubuntu MATE 16.04.6 LTS PPC32, Fedora 27 PPC64, and with openSUSE Tumbleweed 20190722 PPC64 today (see screenshots).

Please test the kernels.

Thanks,
Christian

Posted: **Mon Dec 02, 2019 9:49 pm**

Kernel 5.5 Alpha 4 Running on the AmigaOne X5000

Big picture http://www.skateman.nl/wp-content/uploa ... 214718.png

Posted: **Tue Dec 03, 2019 8:54 am**

Skateman wrote:Kernel 5.5 Alpha 4 Running on the AmigaOne X5000

Thanks a lot for testing the alpha4!

Posted: **Wed Dec 04, 2019 3:34 pm**

Great news!

Mike Rapoport wrote: Some powerpc platforms (e.g. 85xx) limit DMA-able memory way below 4G. If a
system has more physical memory than this limit, the swiotlb buffer is not
addressable because it is allocated from memblock using top-down mode.

Force memblock to bottom-up mode before calling swiotlb_init() to ensure
that the swiotlb buffer is DMA-able.

Code: Select all

arch/powerpc/mm/mem.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index be941d382c8d..14c2c53e3f9e 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -260,6 +260,14 @@ void __init mem_init(void)
 	BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
 
 #ifdef CONFIG_SWIOTLB
+	/*
+	 * Some platforms (e.g. 85xx) limit DMA-able memory way below
+	 * 4G. We force memblock to bottom-up mode to ensure that the
+	 * memory allocated in swiotlb_init() is DMA-able.
+	 * As it's the last memblock allocation, no need to reset it
+	 * back to to-down.
+	 */
+	memblock_set_bottom_up(true);
 	swiotlb_init(0);
 #endif

Link to the thread: [PATCH] powerpc: ensure that swiotlb buffer is allocated from low memory