[2/9] ppc/pnv/homer: Make dummy reads return 0

Commit Message

Nicholas Piggin Dec. 10, 2024, 3:04 a.m. UTC

HOMER memory implements some dummy registers that return a nonsense
value to satisfy skiboot accesses caused by "SLW" init and register
save/restore programming that has never worked under QEMU:

[    0.265000943,3] SLW: Failed to set HRMOR for CPU 0,RC=0x1
[    0.265356988,3] Disabling deep stop states

To simplify a later change to implement HOMER as a RAM area, make
these return zero, which has the same result.

Signed-off-by: Nicholas Piggin <[e-mail]>
---
 hw/ppc/pnv_homer.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Patch

diff --git a/hw/ppc/pnv_homer.c b/hw/ppc/pnv_homer.c
index 9aedc08cc00..658b0186a38 100644
--- a/hw/ppc/pnv_homer.c
+++ b/hw/ppc/pnv_homer.c
@@ -89,7 +89,7 @@  static uint64_t pnv_power8_homer_read(void *opaque, hwaddr addr,
     case PNV8_OCC_VCS_VOLTAGE_IDENTIFIER:
         return 1;
     case PNV8_OCC_PSTATE_DATA:
-        return 0x1000000000000000;
+        return 0;
     /* P8 frequency for 0, 1, and 2 pstates */
     case PNV8_OCC_PSTATE_ZERO_FREQUENCY:
     case PNV8_OCC_PSTATE_ONE_FREQUENCY:
@@ -259,7 +259,7 @@  static uint64_t pnv_power9_homer_read(void *opaque, hwaddr addr,
         return 0x01;
     case PNV9_CHIP_HOMER_BASE:
     case PNV9_CHIP_HOMER_IMAGE_POINTER:
-        return 0x1000000000000000;
+        return 0;
     case PNV9_DYNAMIC_DATA_STATE:
         return 0x03; /* active */
     }