1334f446cc
y or n per optional driver (virtio-gpu, stdvga, e1000, rtl8139, native r8169, AC'97, AHCI, NVMe), all y except the native r8169, overridable with make DRV_X=n. Only drivers nothing else calls can be optional; the registry #ifdefs them and the Makefile leaves their objects out. Built with every one off (links, none of their symbols present), with r8169 on, and by default. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EVRhxi9zpdW2uDUN4FVcao
45 lines
2.1 KiB
Text
45 lines
2.1 KiB
Text
# Which drivers are compiled into the kernel.
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#
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# y compiled in, and enabled: it is offered every device it can drive
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# n not compiled in: the code is not linked and the kernel never knows it
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#
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# Everything is y unless it says otherwise. Change a line, or override one for
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# a single build:
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#
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# make DRV_E1000=n DRV_NVME=n
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#
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# A changed value rebuilds only kernel/drivers/registry.o and the link.
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#
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# These are the drivers that can be left out cleanly: nothing else in the kernel
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# calls them, they are only offered a device by the registry
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# (kernel/drivers/registry.c). The others cannot be, because the rest of the
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# kernel calls into them directly, and are not listed:
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#
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# vga_fb the boot framebuffer: the console and the crash screen draw on it
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# xhci, usb core, usb hid / storage / hub
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# the keyboard and the root disk can arrive over USB, bio.c and
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# the hotplug thread call in, and so does the I2C-HID touchpad
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# PS/2, IDE, the 16550 UART
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# fixed-address legacy devices (kernel/dev/)
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#
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# Linux's own drivers, run in a process by ldlsd, are not here: they are files in
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# the image (make ldls-r8169), not code in the kernel.
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# --- display --------------------------------------------------------------
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DRV_VGA_PCI = y # the stdvga/Bochs card (the framebuffer driver stays regardless)
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DRV_VIRTIO_GPU = y # QEMU's virtio-gpu: mode setting and an explicit flush
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# --- network ----------------------------------------------------------------
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DRV_E1000 = y # Intel 8254x and 8257x
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DRV_RTL8139 = y # Realtek 8139 (the one Realtek part QEMU emulates)
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# The native RTL8168/8111 driver. Off by default because the laptop's NIC is
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# driven by Linux's r8169 under LDLS (etc/schinit/ldls-r8169.job), and a driver
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# here would claim the device first. Turn it on for a machine without that job.
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DRV_R8169 = n
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# --- storage ----------------------------------------------------------------
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DRV_AHCI = y # SATA
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DRV_NVME = y # NVMe SSDs
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# --- audio ------------------------------------------------------------------
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DRV_AC97 = y # Intel AC'97 (QEMU's and old boards')
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