Date: Wed, 1 Aug 2007 21:11:20 +0200 From: Andrea Franceschini <andrea.franceschini@postecom.it> To: freebsd-hardware@FreeBSD.ORG Subject: Sun GEM Gigabit Ethernet support on x86 FreeBSD Message-ID: <20070801191120.GB81152@postecom.it>
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Hi,
I'm trying to use an PCI SUN-GEM gigabit ethernet adapter on
x86 based server with FreeBSD.
It seems that the module if_gem actually exists but it relies
on OpenFirmware to read board data (such as mac-address), thus
it doesn't work on X86 FreeBSD.
To my comprension this is because the x86 platform lacks support
for openfirmware.
Nonetheless, it seems that the same board is supported on other O.S.
like OpenBSD or Linux using specific code that bypass openfirmware
reading directly the data from PCI Expansion ROM.
Actually, even FreeBSD uses the same trick but it does so for
another SUN board (if_hme), so I thought that it was worth the
try to add the missing code on if_gem device.
After a few(!!) tries I managed to access the PCI Expansion ROM
but I found out that it was empty, or at least full of 0xFF...
At the beginning I thought that something was wrong with my code
but when I finally managed to dump the ROM contents using the
tool 'pciroms' I found out that actually the ROM content was
'1'-filled.
So what I'm wondering what I'm doing wrong.
This is the code that should read the Expansion ROM reg:
#define PCI_ROM_REG 0x30
#define PCI_ROM_ENABLE 0x00000001
#define PCI_ROM_ADDR_MASK 0xfffff800
#define PCI_ROM_ADDR(mr) \
((mr) & PCI_ROM_ADDR_MASK)
#define PCI_ROM_SIZE(mr) \
(PCI_ROM_ADDR(mr) & -PCI_ROM_ADDR(mr))
rrid=PCI_ROM_REG;
address = pci_read_config(dev, PCI_ROM_REG,4);
device_printf(dev,"valore dell'address %08x\n",address);
pci_write_config(dev, PCI_ROM_REG, 0xfffffffe,4);
mask = pci_read_config(dev, PCI_ROM_REG,4);
address |= PCI_ROM_ENABLE;
pci_write_config(dev, PCI_ROM_REG, address,4);
size = PCI_ROM_SIZE(mask);
bus_set_resource(dev, SYS_RES_MEMORY, rrid,(u_long )&rrid,size);
rres = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rrid, RF_ACTIVE);
if ( rres == NULL) {
device_printf(dev, "could not map PROM registers\n");
error = ENXIO;
goto fail_sres;
}
romt = rman_get_bustag(rres);
romh = rman_get_bushandle(rres);
/* Read PCI expansion PROM header. */
bus_space_read_region_1(romt, romh, 0, buf, sizeof(buf));
for (i=0; i<1048576 ; i++ ) {
if ( buf[i] != 0xff ) {
device_printf(dev,"Memory address %d = %x \n",i,buf[i]);
}
}
Should I look elsewhere for the VPD to be found ?
There's some particular init sequence to do in order to
have the Expansion ROM loaded with the correct code?
Any advice or suggestion is more than welcome :)
Thanks
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