MMIO register space was off by 4 bytes, bottom bits of
PCI BAR registers are not part of the address.

Test boot on real hardware:

PCI device 00:14.7 (vd=1022:7813 c=0805)

Searching bootorder for: /pci@i0cf8/*@14,7
sdhci@0xfeb25500 ver=1001 cap=31fe3fb2 2570
sdcard_set_frequency 63 400 8000
sdcard_pio command stop (code=1)
sdcard_set_frequency 63 25000 200
Found sdcard at 0xfeb25500: SD card SD01G 982MiB
Registering bootable: SD card SD01G 982MiB (type:2 prio:103 data:f46e0)

Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
---
 src/hw/sdcard.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/hw/sdcard.c b/src/hw/sdcard.c
index d80b473..be726d2 100644
--- a/src/hw/sdcard.c
+++ b/src/hw/sdcard.c
@@ -527,6 +527,7 @@ sdcard_pci_setup(void *data)
     wait_preempt();  // Avoid pci_config_readl when preempting
     // XXX - bars dependent on slot index register in pci config space
     u32 regs = pci_config_readl(pci->bdf, PCI_BASE_ADDRESS_0);
+    regs &= PCI_BASE_ADDRESS_MEM_MASK;
     pci_config_maskw(pci->bdf, PCI_COMMAND, 0,
                      PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
     int prio = bootprio_find_pci_device(pci);
--
1.9.1