On 01.09.20 23:39, Richard Henderson wrote: > On 9/1/20 11:34 AM, Helge Deller wrote: >> -/* QEMU fw_cfg interface port */ >> -#define QEMU_FW_CFG_IO_BASE (MEMORY_HPA + 0x80) >> +#define FW_CFG_IO_BASE 0xfffa0000 > > Why is this value changing?
Devices on hppa occupy at least 4k starting at the HPA, so MEMORY_HPA+4k is blocked (by Linux) for the memory module. I noticed this when testing the new Linux kernel patch to let the fw_cfg entries show up in Linux under /proc: https://patchwork.kernel.org/patch/11715133/ The Linux kernel driver could not allocate the region for fw_cfg. This new base address seems to not conflict. Helge
