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SubjectRe: [PATCH 0/5] coreboot table bus and framebuffer driver
On Wed, Jan 24, 2018 at 07:41:15PM -0600, Samuel Holland wrote:
> On many systems, coreboot[1] firmware can initialize graphics hardware
> and set up a high-resolution linear framebuffer. It exports information
> about this framebuffer, along with various other information, in a table
> discoverable via ACPI or a device tree.
> coreboot also supports booting Linux directly from flash as a "payload".
> Projects such as Heads[2], u-root[3], and petitboot[4] provide a minimal
> userland that can then be used to chainload (via kexec) into a full
> Linux system loaded from disk or over the network.
> Fitting even a minimal Linux system on an SPI flash chip is challenging.
> Reusing the framebuffer setup from coreboot provides an enormous benefit
> to these projects by allowing them to omit full graphics drivers from
> their kernel builds. It also speeds up boot times by avoiding duplicated
> effort, and because coreboot's graphics initialization is often much
> faster than the Linux driver.
> Patch 1 of this series expands coreboot table support into an enumerable
> bus that devices can hang off of. Patches 2-3 convert the existing
> drivers to use the new bus structure instead of ad-hoc platform devices,
> and patch 4 removes the old coreboot_table_find function.
> Finally, patch 5 adds a new driver for the coreboot-initialized
> framebuffer. It improves on earlier work[5] by being architecture-
> independent and not needing to scan through low memory.
> This patchset has been tested on a Lenovo ThinkPad X220, and earlier
> versions of these patches have been tested by various members of the
> coreboot community on other hardware.

It would be great to get some of the google developers to ack these, as
this touches their code...


greg k-h

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