Hi,

On Montag, 14. April 2008, Peer Chen wrote:
quoted text
> Volker,
> I mean add msleep(x) function between writel(HOST_AHCI_EN, mmio + HOST_CTL)
> and readl(mmio + HOST_CTL) cause we ever met a bug that writing data to the
> AHCI BAR5 but need a delay to get correct read back value. But forget it,
> looks like it's not the same case here. Which mode do you set(ahci or
> non-raid) when you encountered the issue that the AHCI_EN bit failed to
> set? I found we have workaround for AHCI_EN bit setting in our Bios
> programming guide for AHCI mode.

you mean this?

[    0.363828] ------------[ cut here ]------------
[    0.363828] WARNING: at drivers/ata/ahci.c:645 ahci_init_one+0x190/0xa3a()
[    0.363828] Modules linked in:
[    0.363828] Pid: 1, comm: swapper Not tainted 2.6.25-rc8 #2
[    0.363828]
[    0.363828] Call Trace:
[    0.363828]  [<ffffffff8022c5a5>] warn_on_slowpath+0x51/0x63
[    0.363832]  [<ffffffff80220061>] __ioremap+0x8/0x197
[    0.363872]  [<ffffffff803921f4>] pci_conf1_read+0xb2/0xbd
[    0.363911]  [<ffffffff802f3316>] pcim_iomap_release+0x0/0x2c
[    0.363950]  [<ffffffff802f3316>] pcim_iomap_release+0x0/0x2c
[    0.363989]  [<ffffffff803471a9>] devres_find+0x4b/0x65
[    0.364028]  [<ffffffff8036e4cd>] ahci_init_one+0x190/0xa3a
[    0.364067]  [<ffffffff802af837>] sysfs_addrm_finish+0x1d/0x209
[    0.364107]  [<ffffffff80284014>] ifind+0x34/0x8d
[    0.364145]  [<ffffffff802af54e>] sysfs_find_dirent+0x1b/0x2f
[    0.364184]  [<ffffffff802eb75d>] ida_get_new_above+0xf0/0x180
[    0.364223]  [<ffffffff802af837>] sysfs_addrm_finish+0x1d/0x209
[    0.364263]  [<ffffffff802b0378>] sysfs_create_link+0xb6/0x102
[    0.364303]  [<ffffffff802f8664>] pci_device_probe+0x4c/0x72
[    0.364342]  [<ffffffff80344c48>] driver_probe_device+0xb5/0x132
[    0.364381]  [<ffffffff80344ddb>] __driver_attach+0x6f/0xaf
[    0.364419]  [<ffffffff80344d6c>] __driver_attach+0x0/0xaf
[    0.364458]  [<ffffffff80344d6c>] __driver_attach+0x0/0xaf
[    0.364498]  [<ffffffff8034400a>] bus_for_each_dev+0x44/0x6f
[    0.364538]  [<ffffffff802a9b57>] proc_match+0x23/0x2d
[    0.364576]  [<ffffffff80344876>] bus_add_driver+0xae/0x1f4
[    0.364614]  [<ffffffff8034500a>] driver_register+0x59/0xce
[    0.364654]  [<ffffffff802f88a5>] __pci_register_driver+0x4a/0x7d
[    0.364701]  [<ffffffff804e56b8>] kernel_init+0x14f/0x2b9
[    0.364740]  [<ffffffff8020be98>] child_rip+0xa/0x12
[    0.364779]  [<ffffffff804e5569>] kernel_init+0x0/0x2b9
[    0.364817]  [<ffffffff8020be8e>] child_rip+0x0/0x12
[    0.364854]
[    0.364891] ---[ end trace ea9d541113ecaf1e ]---

this happened with AHCI mode set in bios, pci=nomsi as kernel boot parameter 
and kernel 2.6.25-rc8.

Something similar looking happened without pci=nomsi, but in that case I could 
not scroll back to even make a picture because of the kernel panic (rootfs 
not found).

Glück Auf
Volker
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