From: Maciej W. Rozycki macro@linux-mips.org
[ Upstream commit 756d6d836dbfb04a5a486bc2ec89397aa4533737 ]
The LittleSur board is marked for high memory support and therefore clearly must provide a way to have enough memory installed for some to be present outside the low 4GiB physical address range. With the memory map of the BCM1250 SOC it has been built around it means over 1GiB of actual DRAM, as only the first 1GiB is mapped in the low 4GiB physical address range[1].
Complement commit cce335ae47e2 ("[MIPS] 64-bit Sibyte kernels need DMA32.") then and also enable ZONE_DMA32 for LittleSur.
[1] "BCM1250/BCM1125/BCM1125H User Manual", Revision 1250_1125-UM100-R, Broadcom Corporation, 21 Oct 2002, Section 3: "System Overview", "Memory Map", pp. 34-38
Signed-off-by: Maciej W. Rozycki macro@linux-mips.org Signed-off-by: Paul Burton paul.burton@mips.com Reviewed-by: Christoph Hellwig hch@lst.de Patchwork: https://patchwork.linux-mips.org/patch/21107/ Fixes: cce335ae47e2 ("[MIPS] 64-bit Sibyte kernels need DMA32.") Cc: Ralf Baechle ralf@linux-mips.org Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/mips/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 422624ca01329..596cbda9cb3d3 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -773,6 +773,7 @@ config SIBYTE_LITTLESUR select SYS_SUPPORTS_BIG_ENDIAN select SYS_SUPPORTS_HIGHMEM select SYS_SUPPORTS_LITTLE_ENDIAN + select ZONE_DMA32 if 64BIT
config SIBYTE_SENTOSA bool "Sibyte BCM91250E-Sentosa"