[U-Boot] Should I create a new UCLASS for Bootstate or Add new Ops to UCLASS_BOOTCOUNT ??
sjg at chromium.org
Mon Sep 9 23:07:43 UTC 2019
On Sat, 7 Sep 2019 at 18:34, Joel Peshkin <joel.peshkin at broadcom.com> wrote:
> Hi Simon,
> I need to create and upstream driver for a set of functions that manage volatile information that persist across reboots. These are simple registers that survive reboot but get cleared on power-cycle. The key operations we need to implement are ...
> Called before rebooting (from uboot proper or from Linux)... sets flags to cause the next reboot to select an alternate image
> Called during boot (during SPL or TPL if using dual-uboot images as we do). Gets the status of the alternate_image flag and clears it.
> In our implementation, we have registers that always clear on power-cycle, but survive the soft reboot. Other implementations, where there is no such register, would still only use the alternate image once as long as the boot attempt reaches the getandclear_alternate_image() function, so drivers similar to those available in bootcount could easily handle the same function.
> Would you prefer that I create a new UCLASS or is it OK to extend the UCLASS_BOOTCOUNT operations and upstream the new operations, supported on a subset of the drivers that implement UCLASS_BOOTCOUNT ??
I think that adding new operations makes sense for now.
I've added a few other people for thoughts.
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