From 6e081324facf9aeece9c286774bab5af3b8d6099 Mon Sep 17 00:00:00 2001 From: BALATON Zoltan Date: Sat, 25 Nov 2023 15:01:35 +0100 Subject: [PATCH] ide/via: Fix BAR4 value in legacy mode Return default value in legacy mode for BAR4 when unset. This can't be set in reset method because BARs are cleared on reset so we return it instead when BARs are read in legacy mode. This fixes UDMA on amigaone with AmigaOS. Signed-off-by: BALATON Zoltan Message-ID: <20231125140135.AF6A075A4C3@zero.eik.bme.hu> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- hw/ide/via.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/hw/ide/via.c b/hw/ide/via.c index 2d3124ebd7..3f3c484253 100644 --- a/hw/ide/via.c +++ b/hw/ide/via.c @@ -163,14 +163,19 @@ static uint32_t via_ide_cfg_read(PCIDevice *pd, uint32_t addr, int len) uint32_t val = pci_default_read_config(pd, addr, len); uint8_t mode = pd->config[PCI_CLASS_PROG]; - if ((mode & 0xf) == 0xa && ranges_overlap(addr, len, - PCI_BASE_ADDRESS_0, 16)) { - /* BARs always read back zero in legacy mode */ - for (int i = addr; i < addr + len; i++) { - if (i >= PCI_BASE_ADDRESS_0 && i < PCI_BASE_ADDRESS_0 + 16) { - val &= ~(0xffULL << ((i - addr) << 3)); + if ((mode & 0xf) == 0xa) { + if (ranges_overlap(addr, len, PCI_BASE_ADDRESS_0, 16)) { + /* BARs 0-3 always read back zero in legacy mode */ + for (int i = addr; i < addr + len; i++) { + if (i >= PCI_BASE_ADDRESS_0 && i < PCI_BASE_ADDRESS_0 + 16) { + val &= ~(0xffULL << ((i - addr) << 3)); + } } } + if (addr == PCI_BASE_ADDRESS_4 && val == PCI_BASE_ADDRESS_SPACE_IO) { + /* BAR4 default value if unset */ + val = 0xcc00 | PCI_BASE_ADDRESS_SPACE_IO; + } } return val;