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raspberrypi4-64.conf: Limit RAM to 3G

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The PCI controller on the Raspberry Pi 4 acts as a DMA controller and can
only address the first 3Gb[1] of the memory space. On 32bit this was
addressed by implementing bouncing buffers[2] but this currently has no
support for arm64. In order to have working USB, as a workaround, we
limit the ram to 3G.

Fixes #446

[1] https://github.com/raspberrypi/linux/issues/3093
[2] https://github.com/raspberrypi/linux/blob/rpi-4.19.y/drivers/pci/controller/pcie-brcmstb-bounce.c

Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
This commit is contained in:
Andrei Gherzan 2019-07-24 16:10:40 +01:00
parent 0d641c8fa9
commit fafad9b025
1 changed files with 1 additions and 1 deletions
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conf/machine/raspberrypi4-64.conf
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@ -31,6 +31,6 @@ KERNEL_IMAGETYPE_UBOOT ?= "Image"
KERNEL_IMAGETYPE_DIRECT ?= "Image"
KERNEL_BOOTCMD ?= "booti"
RPI_EXTRA_CONFIG ?= "\n# Force arm in 64bit mode. See: https://github.com/raspberrypi/firmware/issues/1193.\narm_64bit=1"
RPI_EXTRA_CONFIG ?= "\n# Force arm in 64bit mode. See: https://github.com/raspberrypi/firmware/issues/1193.\narm_64bit=1\n\n# Limit RAM to 3G. See: https://github.com/raspberrypi/linux/issues/3093\ntotal_mem=3072"
ARMSTUB ?= "armstub8-gic.bin"