U-Boot as ARM Coreboot Payload (for Chromebook Duet)
Hello,
Reading https://chromium.googlesource.com/chromiumos/docs/+/master/developer_mode.md, it appears U-Boot should work as an alternate firmware on new ARM Chromebooks.
Trying on my Duet (Kukui/Krane), this doesn't work. Looking at the RW_LEGACY contents, there's basically nothing there from the factory.
I tried "make coreboot_defconfig" from u-boot master, but it looks like this is x86 only.
Any way to get this working on ARM(64)?
Thanks, --Matt
Hi Matthew,
On Sun, 2 Aug 2020 at 20:17, Matthew Grochowalski matt@gwalski.com wrote:
Hello,
Reading https://chromium.googlesource.com/chromiumos/docs/+/master/developer_mode.md, it appears U-Boot should work as an alternate firmware on new ARM Chromebooks.
Trying on my Duet (Kukui/Krane), this doesn't work. Looking at the RW_LEGACY contents, there's basically nothing there from the factory.
I tried "make coreboot_defconfig" from u-boot master, but it looks like this is x86 only.
Any way to get this working on ARM(64)?
I think this is Mediatek and U-Boot doesn't have support for that particular MT part, at least in mainline. I suspect it will happen at some point.
The altfw U-Boot feature works on x86 Chromebooks only, at present. That said, most tegra and rockchip Chromebooks support U-Boot running 'bare-metal'.
Regards, Simon
Simon,
Is there a way to replace the firmware on those boards with u-boot? I have a Tegra, a rockchip, and a pair of Samsung Exynos based Chromebooks that are end of life for ChromeOS but are still quite useful hardware platforms if there was a way to replace entirely the bootloader with u-boot I could have hardware running supported operating systems.
Dennis
On Sun, Aug 2, 2020 at 10:00 PM Simon Glass sjg@chromium.org wrote:
Hi Matthew,
On Sun, 2 Aug 2020 at 20:17, Matthew Grochowalski matt@gwalski.com wrote:
Hello,
Reading https://chromium.googlesource.com/chromiumos/docs/+/master/developer_mode.md, it appears U-Boot should work as an alternate firmware on new ARM Chromebooks.
Trying on my Duet (Kukui/Krane), this doesn't work. Looking at the RW_LEGACY contents, there's basically nothing there from the factory.
I tried "make coreboot_defconfig" from u-boot master, but it looks like this is x86 only.
Any way to get this working on ARM(64)?
I think this is Mediatek and U-Boot doesn't have support for that particular MT part, at least in mainline. I suspect it will happen at some point.
The altfw U-Boot feature works on x86 Chromebooks only, at present. That said, most tegra and rockchip Chromebooks support U-Boot running 'bare-metal'.
Regards, Simon
Hi Dennis,
On Mon, 3 Aug 2020 at 11:08, Dennis Gilmore dgilmore@fedoraproject.org wrote:
Simon,
Is there a way to replace the firmware on those boards with u-boot? I have a Tegra, a rockchip, and a pair of Samsung Exynos based Chromebooks that are end of life for ChromeOS but are still quite useful hardware platforms if there was a way to replace entirely the bootloader with u-boot I could have hardware running supported operating systems.
Yes you can do that, likely with all of those you mention, although the Samsung may already use U-Boot.
You can flash an image on the device's command line. The problem is getting back if you brick it. You need a servo board to be able to reflash it.
Regards, Simon
Dennis
On Sun, Aug 2, 2020 at 10:00 PM Simon Glass sjg@chromium.org wrote:
Hi Matthew,
On Sun, 2 Aug 2020 at 20:17, Matthew Grochowalski matt@gwalski.com wrote:
Hello,
Reading https://chromium.googlesource.com/chromiumos/docs/+/master/developer_mode.md, it appears U-Boot should work as an alternate firmware on new ARM Chromebooks.
Trying on my Duet (Kukui/Krane), this doesn't work. Looking at the RW_LEGACY contents, there's basically nothing there from the factory.
I tried "make coreboot_defconfig" from u-boot master, but it looks like this is x86 only.
Any way to get this working on ARM(64)?
I think this is Mediatek and U-Boot doesn't have support for that particular MT part, at least in mainline. I suspect it will happen at some point.
The altfw U-Boot feature works on x86 Chromebooks only, at present. That said, most tegra and rockchip Chromebooks support U-Boot running 'bare-metal'.
Regards, Simon
participants (3)
-
Dennis Gilmore -
Matthew Grochowalski -
Simon Glass