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[Qemu-devel] Fatal error on accessing IO memory of smc91c111 NIC
From: |
Thorsten Zitterell |
Subject: |
[Qemu-devel] Fatal error on accessing IO memory of smc91c111 NIC |
Date: |
Mon, 25 May 2009 13:53:24 +0200 |
User-agent: |
Thunderbird 2.0.0.21 (X11/20090318) |
Hi,
there seems to be a problem when accessing the IO memory of an emulated gumstix
(PXA) with smc91c111 NIC. I suspect that it has to do with the base address
which is not a multiple of the page size. Here, the NIC is registered at base
address 0x04000300:
smc91c111_init(&nd_table[0], 0x04000300,
pxa2xx_gpio_in_get(cpu->gpio)[99]);
According to the last two lines of qemu.log, the NIC is correctly accessed
during guest system boot at address 0400030e (r4+#14):
0xa3f07fdc: strh r5, [r4, #14]
0xa3f07fe0: bl 0xa3f00f5c
Then, qemu panics:
qemu: fatal: smc91c111_write: Bad reg 0:30e
R00=a3ee01f0 R01=a3edefb8 R02=00000001 R03=00008000
R04=04000300 R05=00000000 R06=a3edefb8 R07=a3edefb8
R08=a3edefdc R09=a3ee0230 R10=a3ee01f0 R11=00000000
R12=a3f27488 R13=a3edec34 R14=a3f04148 R15=a3f07fac
PSR=600001d3 -ZC- A svc32
However, the correct reg should be 0:0e - not 0:30e. The fatal error also occurs
with disabled MMU. I have debugged the smc91c111 driver and it gets the wrong
offset value from the calling qemu core.
Could this wrong offset be related cpu_register_physical_memory_offset(...) as
addresses are rounded down to page boundaries?
exec.c:2325:
/* register physical memory. 'size' must be a multiple of the target
page size. If (phys_offset & ~TARGET_PAGE_MASK) != 0, then it is an
io memory page. The address used when calling the IO function is
the offset from the start of the region, plus region_offset. Both
start_addr and region_offset are rounded down to a page boundary
before calculating this offset. This should not be a problem unless
the low bits of start_addr and region_offset differ. */
Can this be fixed by another driver initialization?
Thorsten
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