Messages in this thread Patch in this message | | | From | Olof Johansson <> | Subject | [PATCH] riscv: keep 32-bit kernel to 32-bit phys_addr_t | Date | Mon, 6 Jan 2020 15:16:11 -0800 |
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While rv32 technically has 34-bit physical addresses, no current platforms use it and it's likely to shake out driver bugs.
Let's keep 64-bit phys_addr_t off on 32-bit builds until one shows up, since other work will be needed to make such a system useful anyway.
Signed-off-by: Olof Johansson <olof@lixom.net> --- arch/riscv/Kconfig | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index a31169b02ec06..33a20fa046e0a 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -12,8 +12,9 @@ config 32BIT config RISCV def_bool y - # even on 32-bit, physical (and DMA) addresses are > 32-bits - select PHYS_ADDR_T_64BIT + # While RV32 has 34-bit physical addresses, no known platform + # uses it, so keep it to 32-bit until one shows up to test with. + select PHYS_ADDR_T_64BIT if 64BIT select OF select OF_EARLY_FLATTREE select OF_IRQ -- 2.20.1
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