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Re: page_write_back infinite wait (porting to Mips 4kec SoC)

Subject: Re: page_write_back infinite wait (porting to Mips 4kec SoC)
From: "Luigi 'Comio' Mantellini" <>
Date: Wed, 1 Oct 2008 20:36:26 +0200
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I discovered the trouble...

the bsp code (from my cpu vendor) wrongly writes out the irq_desc vector overwriting some vital kernel structure...

best regards,


Il martedì 23 settembre 2008 14:09:44 Luigi 'Comio' Mantellini ha scritto:

> Hi List,


> I'm working on a 4Kec SoC. I'm trying to port a recent kernel (2.6.26-rcX

> from trunk) to my SoC but I have problem on timers (i think).


> The start sequence (start_kernel @init/main.c) freezes on the

> page_writeback_init() call. The page_writeback_init function calls the

> lock_timer_base function (by means the mod_timer/__mod_timer) that fails

> always the test likely(base!=NULL) (source file kernel/timer.c). The base

> variable (ponter to tvec_base) is always NULL, resulting an infinite loop.


> I'm using the cevt-r4t and csrc-4k standard mips 4k timer (on irq #7). With

> debugger I verified that the c0_compare_interrupt service routine is

> correctly invoked.


> Kindly, can anyone help me to understand what I need to check to solve this

> issue? If you need other information, please, ask me (This is my first mips

> port).


> Thanks in advance.


> best regards.


> luigi


Luigi Mantellini

R&D - Software

Industrie Dial Face S.p.A.

Via Canzo, 4

20068 Peschiera Borromeo (MI), Italy

Tel.: +39 02 5167 2813

Fax: +39 02 5167 2459


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