I was trying to use my old iPod mini firewire (first generation) with a new firewire card I put in my PC (VIA Technologies, Inc. VT6306/7/8), but the iPod was not mounted and failed with the following error: reading config rom failed: no ack It appears that the configuration rom cannot be read after the device max speed is set to something else than SCODE_100.
According to the iPod configuration ROM, it should support SCODE_400. This patch adds a a parameter (force_speed) to the firewire-core module to be able to set the max speed to use with the firewire devices. Signed-off-by: Laurent Vivier <laur...@vivier.eu> --- drivers/firewire/core-device.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c index 5245567..a075827 100644 --- a/drivers/firewire/core-device.c +++ b/drivers/firewire/core-device.c @@ -44,6 +44,17 @@ #include "core.h" +static int force_speed = -1; +module_param_named(force_speed, force_speed, int, 0644); +MODULE_PARM_DESC(force_speed, "Force device speed (default = -1" + ", FW100 = " __stringify(SCODE_100) + ", FW200 = " __stringify(SCODE_200) + ", FW400 = " __stringify(SCODE_400) + ", FW800 = " __stringify(SCODE_800) + ", FW1600 = " __stringify(SCODE_1600) + ", FW3200 = " __stringify(SCODE_3200) + ", FWBETA = " __stringify(SCODE_BETA)); + void fw_csr_iterator_init(struct fw_csr_iterator *ci, const u32 *p) { ci->p = p + 1; @@ -555,6 +566,8 @@ static int read_config_rom(struct fw_device *device, int generation) } device->max_speed = device->node->max_speed; + if (force_speed != -1) + device->max_speed = force_speed & 0xf; /* * Determine the speed of -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/