- Sanitize framebuffer. Original idea from @StevenMattera
- Change clear framebuffer to memset (for grey colors), for performance (we don't use alpha blending, so it does not matter to set it to 0xFF).
- Enable screen backlight after gfx init
- Reduce wait time for emmc/sd read/write retries to 100ms.
Now that the cid/csd/ssr/etc bytes/bitfields are correct:
* MMC/SD: Add cid/csd parsing and use new cid/csd variables
* SD: Add ssr (sd status) reading/parsing
* MMC/SD: Change many hardcoded values to named ones
* MMC/SD: Fix scr and csd byte/bitfield ordering
* MMC: Add ext csd parsing and using these variables isntead of arrays
* MMC: Fix BKOPS support but disabled
* SD: Add partial sd v1 support
* SD: Fix we support low voltage OCR bit
* SD: Add scr parsing and using these variables instead of hardcoded ones
Some vendors, *I'm looking at you Samsung*, report support for 1.8 voltage, even though the card does not support it.
So, disable low voltage support for now until the behavior is changed to act more like what Linux does. (re-initializing the SD card and disables the low voltage switch).
Fix the switch to high speed mode for high voltages also.
Additionally, correct the IF COND reply. 0xAA is the important part.
