On the pxa270, if the udc device is not disabled before jumping to linux, the device fails to initialize in linux because it was left in a running state, and the linux driver assumes that it is in a disabled state.
Signed-off-by: Mike Dunn mikedunn@newsguy.com ---
Arguably, this is a bug in the linux driver, but it seemed pretty simple and benign to just disable it in u-boot. I'll also send a patch to upstream kernel to fix its driver.
arch/arm/include/asm/bootm.h | 1 + arch/arm/lib/bootm.c | 1 + 2 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/arm/include/asm/bootm.h b/arch/arm/include/asm/bootm.h index db2ff94..68189cc 100644 --- a/arch/arm/include/asm/bootm.h +++ b/arch/arm/include/asm/bootm.h @@ -21,6 +21,7 @@
#ifdef CONFIG_USB_DEVICE extern void udc_disconnect(void); +extern void udc_disable(void); #endif
#endif diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c index f3b30c5..6daa7bf 100644 --- a/arch/arm/lib/bootm.c +++ b/arch/arm/lib/bootm.c @@ -105,6 +105,7 @@ static void announce_and_cleanup(void)
#ifdef CONFIG_USB_DEVICE udc_disconnect(); + udc_disable(); #endif cleanup_before_linux(); }