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linux: Allow kexec in userspace to get framebuffer address

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kexec(8) needs to get the framebuffer address in order to set up the
new kernel's boot parameters.  This is one of the reasons that using a
>4.20 kernel in Heads prevents framebuffer graphics from working in the
OS kernel.

Linux 4.20 started hiding this address from userspace, because
userspace is not supposed to need physical memory addresses.  A
workaround was added to keep leaking the address, apparently for some
proprietary userspace OpenGL drivers.  This requires both a Kconfig and
a kernel parameter.

This commit enables the Kconfig on the librem_common config, and the
kernel parameter on the librem_15v4 (where I'm testing this).  We will
need to enable it on other >4.20 configs/boards as well.

Signed-off-by: Jonathon Hall <jonathon.hall@puri.sm>
This commit is contained in:
Jonathon Hall 2023-04-18 13:17:18 -04:00
parent 8ff4b9a51b
commit abbc1b5dd8
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2 changed files with 2 additions and 1 deletions
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2
config/coreboot-librem_15v4.config
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@ -9,5 +9,5 @@ CONFIG_HAVE_ME_BIN=y
CONFIG_TPM_MEASURED_BOOT=y
CONFIG_PAYLOAD_LINUX=y
CONFIG_PAYLOAD_FILE="@BOARD_BUILD_DIR@/bzImage"
CONFIG_LINUX_COMMAND_LINE="iommu=pt quiet loglevel=2 video=eDP-1:1920x1080"
CONFIG_LINUX_COMMAND_LINE="iommu=pt quiet loglevel=2 video=eDP-1:1920x1080 drm_kms_helper.drm_leak_fbdev_smem=1"
CONFIG_LINUX_INITRD="@BOARD_BUILD_DIR@/initrd.cpio.xz"

1
config/linux-librem_common.config
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@ -200,6 +200,7 @@ CONFIG_I2C_SLAVE=y
# CONFIG_X86_PKG_TEMP_THERMAL is not set
CONFIG_MFD_SYSCON=y
CONFIG_DRM=y
CONFIG_DRM_FBDEV_LEAK_PHYS_SMEM=y
CONFIG_DRM_I915=y
CONFIG_DRM_AST=y
CONFIG_FB_VESA=y