omap2_inth_read: Bad register 0x000000f8

[Loïc Minier]

Hi

when starting qemu-linaro from the maverick Linaro Tools PPA 0.14.50-2011.04-1-0ubuntu1~ppa10.10.1 with today's Linaro OMAP3 hwpack and nano rootfs, I get tons of:

omap2_inth_read: Bad register 0x000000f8

which wont stop, hiding the interesting output.

Bye

[Peter Maydell (pmaydell)]

Hmm. That's new since the 1105 beta hwpack/rootfs, which don't do that. (We haven't managed to automate latest-hwpack/rootfs testing on qemu yet.)

Last time we had one of these it turned out to be a kernel bug.

[Peter Maydell (pmaydell)]

From arch/arm/mach-omap2/include/mach/entry-macro.S:
                /*
                 * ti816x has additional IRQ pending register. Checking this
                 * register on omap2 & omap3 has no effect (read as 0).
                 */
                ldr \irqnr, [\base, #0xf8] /* IRQ pending reg 4 */
                cmp \irqnr, #0x0

...ie it's deliberately reading a register which doesn't exist, which is what QEMU is complaining about.

However I don't suppose we'll get much traction getting them to change that, so pragmatism suggests silencing the QEMU warning for this register at least :-(

[Peter Maydell (pmaydell)]

This commit:

http://git.linaro.org/gitweb?p=kernel/linux-linaro-2.6.38.git;a=commitdiff;h=01001712c96f82e6317b1e09729d8fc4bcc66957