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VGA adapters need to claim memory and i/o

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transactions even if they do not have any
i/o or memory bars. E.g. PCI spec, page 297,
gives an example of such a device:

    Programming interface 0000 0000b
    VGA-compatible controller. Memory
    addresses 0A 0000h through 0B
    FFFFh. I/O addresses 3B0h to 3BBh
    and 3C0h to 3DFh and all aliases of
    these addresses.

While bios could check for these devices and special-case them, it is
easier to fix this by enabling i/o and memory space unconditionally:
devices that do not support it will just ignore this setting.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>



git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@643 f158a5a8-5612-0410-a976-696ce0be7e32
This commit is contained in:
Michael S. Tsirkin
2009-12-10 00:17:17 +00:00
committed by Laurent Vivier
parent 3ef33eb736
commit 1f94ed5998
1 changed files with 4 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/pci.c
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@@ -732,10 +732,6 @@ static void ob_pci_configure_bar(pci_addr addr, pci_config_t *config,
base = *io_base;
min_align = 1 << 7;
amask = 0x00000001;
pci_config_write16(addr, PCI_COMMAND,
pci_config_read16(addr,
PCI_COMMAND) |
PCI_COMMAND_IO);
} else {
/* Memory Space */
base = *mem_base;
@@ -744,10 +740,6 @@ static void ob_pci_configure_bar(pci_addr addr, pci_config_t *config,
if (reg == 6) {
smask |= 1; /* ROM */
}
pci_config_write16(addr, PCI_COMMAND,
pci_config_read16(addr,
PCI_COMMAND) |
PCI_COMMAND_MEMORY);
}
*p_omask = smask & amask;
smask &= ~amask;
@@ -788,6 +780,7 @@ ob_pci_configure(pci_addr addr, pci_config_t *config, int num_regs, int rom_bar,
{
uint32_t omask;
uint16_t cmd;
int reg;
pci_addr config_addr;
@@ -807,6 +800,9 @@ ob_pci_configure(pci_addr addr, pci_config_t *config, int num_regs, int rom_bar,
ob_pci_configure_bar(addr, config, reg, config_addr,
&omask, mem_base, io_base);
}
cmd = pci_config_read16(addr, PCI_COMMAND);
cmd |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
pci_config_write16(addr, PCI_COMMAND, cmd);
}
static void ob_scan_pci_bus(int bus, unsigned long *mem_base,