Device tree memory regions may have sizes larger than 4GB.
Instead of silently truncating a 64 bit size when we pass it
to arm_add_memory(), split large regions into 2GB chunks.
Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
---
With this patch, I can take a device tree which has been tweaked
so its #address-cells and #size-cells are both 2, and boot it on
a QEMU vexpress-a15 model with >4GB of RAM, and have the kernel
actually detect the right amount of RAM. [the qemu bit needs some
patches I haven't posted yet.]
Since I'm not really a kernel dev I thought I'd post this to
linaro-dev first in the hope of a bit of friendly local review
before venturing onto lkml :-)
(Apologies to those on cc who got this twice because I mistyped
the linaro-dev email address.)
arch/arm/kernel/devtree.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c
index bee7f9d..79a6e66 100644
--- a/arch/arm/kernel/devtree.c
+++ b/arch/arm/kernel/devtree.c
@@ -26,6 +26,11 @@
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
{
+ while (size > 0x80000000) {
+ arm_add_memory(base, 0x80000000);
+ base += 0x80000000;
+ size -= 0x80000000;
+ }
arm_add_memory(base, size);
}
--
1.7.9.5
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