This commit adds new Kconfig options and a code snippet to support
VGA mode 12 within the FSP (Firmware Support Package) 2.0. The
changes allow platforms to select VGA mode 12 and configure it.
The key features are:
- Introduces `FSP_VGA_MODE12` to enable VGA mode 12 support.
- A new `FSP_VGA_MODE12_BPP` option defines the bits per pixel,
defaulting to 4 for color mode.
- A bitmap buffer is allocated on the stack and supplied to FSP
based on the configured bits per pixel.
BUG=b:406725440
TEST=Verify VGA text rotation on Google/Felino.
Change-Id: Iaa3a64b7c8c735d8329b3596f4be315871bc7fa4
Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/89090
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
74113f5d5e