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[Qemu-devel] [PATCH] [RESEND2] Qemu unmaintained?
From: |
Bernhard Kauer |
Subject: |
[Qemu-devel] [PATCH] [RESEND2] Qemu unmaintained? |
Date: |
Wed, 9 Sep 2009 14:18:17 +0200 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
Its wednesday again, time to resend a patch to the list.
Until today the following happened in this endless story:
1. I wrote an RTC driver according to the manual which works on real
hardware but not on Qemu.
2. I traced the bug back to the first public version of Bochs. Its
seems to be also
present in all derived version: Qemu, KVM, Xen, VBox...
3. I send a patch to the Qemu list at least 4 times.
4. I never got a single response to my patch.
Thus I have to assume that device models in Qemu are unmaintained: further
resending
does not make any sense in this case.
I still hope somebody will step up and take a stake in this story. Otherwise
Qemu
will be more and more unusable. For me and probably others.
Greetings,
Bernhard Kauer
On Wed, Sep 02, 2009 at 09:49:05AM +0200, Bernhard Kauer wrote:
> The RTC emulation does not set the IRQ flags independent of the IRQ enable
> bits.
>
> The original MC146818A datasheet from 1984 notes:
> "flag bits in Register C [...] are set independent of the
> state of the corresponding enable bits in Register B"
> Similar sections can be found in newer documentation e.g. in rtc82885.
>
> Qemu and Bochs set the IRQ flags only if they are enabled,
> which breaks drivers polling on them.
>
> The following patch corrects this for the update-ended-flag in Qemu only.
> It does not fix the handling of the other flags.
>
>
> Signed-off-by: Bernhard Kauer <address@hidden>
>
>
> diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
> index 2022548..2b040a7 100644
> --- a/hw/mc146818rtc.c
> +++ b/hw/mc146818rtc.c
> @@ -421,9 +421,10 @@ static void rtc_update_second2(void *opaque)
> }
>
> /* update ended interrupt */
> + s->cmos_data[RTC_REG_C] |= REG_C_UF;
> if (s->cmos_data[RTC_REG_B] & REG_B_UIE) {
> - s->cmos_data[RTC_REG_C] |= 0x90;
> - rtc_irq_raise(s->irq);
> + s->cmos_data[RTC_REG_C] |= REG_C_IRQF;
> + rtc_irq_raise(s->irq);
> }
>
> /* clear update in progress bit */
>
>
>
- [Qemu-devel] [PATCH] [RESEND] RTC polling mode broken, Bernhard Kauer, 2009/09/02
- [Qemu-devel] [PATCH] [RESEND2] Qemu unmaintained?,
Bernhard Kauer <=
- Re: [Qemu-devel] [PATCH] [RESEND2] Qemu unmaintained?, Amit Shah, 2009/09/09
- Re: [Qemu-devel] [PATCH] [RESEND2] Qemu unmaintained?, Kevin Wolf, 2009/09/09
- Re: [Qemu-devel] [PATCH] [RESEND2] Qemu unmaintained?, Anthony Liguori, 2009/09/09
- Re: [Qemu-devel] [PATCH] [RESEND2] Qemu unmaintained?, Bernhard Kauer, 2009/09/09
- Re: [Qemu-devel] [PATCH] [RESEND2] Qemu unmaintained?, Amit Shah, 2009/09/10
- Re: [Qemu-devel] [PATCH] [RESEND2] Qemu unmaintained?, Reimar Döffinger, 2009/09/10