On Mon, 2022-05-23 at 19:11 +0200, Sven Anderson wrote: > > I had a couple of sleepless nights trying to find out why this didn't > work for my MMIO UART (Intel Cannon Lake PCH Intel C246), so I > thought I would share my findings with others in a similar situation. > (See below.) > .../... > > This code assumes that the registers are only 8 bit wide. Apparently > for my chipset they are 32 bits wide, so it only (finally) worked > when I rewrote this code to address and write full grub_uint32_t > values, like this: > > ------ > volatile grub_uint32_t* p = (void*)(port->mmio_base); > *(p + reg) = (grub_uint32_t)(value); > ------
Sorry, I dopped the ball on this for a while. Getting back to it and will re-submit the patches. Can you send me a dump of your SPCR table ? I'd like to see if it properly says "32-bit" there to auto-detect this. Cheers, Ben. _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
