Re: [Qemu-devel] [PATCH 1/2] m48t59: drop obsolete address base arithmetic

["Andreas Färber" <afaerber@suse.de>]

Am 15.10.2011 15:50, schrieb Blue Swirl:
> Remove now incorrect address base arithmetic, missed by
> 9936d6e42392f1440505dfa9df065eabd251cadf. Fixes Sparc64 boot.

...but breaks PReP boot:

ERROR: BUG caught...
BIOS execution exception
nip=0x05800000 msr=0x00002000 dar=0x00000000 dsisr=0x00000000
Stopping execution

I verified by checking out the preceding commit, applying a variation of
http://patchwork.ozlabs.org/patch/134519/ on top; that restored PReP
boot to what it used to look like.

Any insights?

If I revert this commit on HEAD instead, then the above error
disappears, too, but there's another regression with the kernel not
being able to read the hda or something.

The write access fix seems unrelated.

Andreas

> Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
> ---
>  hw/m48t59.c |    2 --
>  1 files changed, 0 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/m48t59.c b/hw/m48t59.c
> index f318e67..dba5796 100644
> --- a/hw/m48t59.c
> +++ b/hw/m48t59.c
> @@ -480,7 +480,6 @@ static void NVRAM_writeb (void *opaque, uint32_t
> addr, uint32_t val)
>  {
>      M48t59State *NVRAM = opaque;
> 
> -    addr -= NVRAM->io_base;
>      NVRAM_PRINTF("%s: 0x%08x => 0x%08x\n", __func__, addr, val);
>      switch (addr) {
>      case 0:
> @@ -505,7 +504,6 @@ static uint32_t NVRAM_readb (void *opaque, uint32_t addr)
>      M48t59State *NVRAM = opaque;
>      uint32_t retval;
> 
> -    addr -= NVRAM->io_base;
>      switch (addr) {
>      case 3:
>          retval = m48t59_read(NVRAM, NVRAM->addr);

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