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A bug in eCos PCI library for NEC-VRC473...?

To: <ecos-discuss at sources dot redhat dot com>
Subject: [ECOS] A bug in eCos PCI library for NEC-VRC473...?
From: "Ling Su" <lingsu at palmmicro dot com>
Date: Fri, 8 Sep 2000 19:20:23 -0700
Cc: "Jonathan Larmour" <jlarmour at redhat dot com>

Hello, Jifl,

After hacking the eCos hal layer code, I guess following might be a bug in the eCos PCI library, please check,

In the /hal/mips/vrc4373/include/plf_io.h: #define HAL_PCI_PHYSICAL_MEMORY_BASE 0xC000000

In the /hal/mips/vrc4373/src/platform.S: init 2 PCI master address windows registers as 0x1c0fd01c and 0x80081080, which means (From NEC 4373 manual page 37) only the second one is enabled and mapps CPU (virtual) address 0x800xxxxx to PCI physical 0x800xxxxx. Is that correct? Then when I use pci library to allocate PCI memory, it always maps to 0xC0xxxxxx. It won't be decoded by VR4373, so the PCI can not be accessed via the allocated memory.

I am not sure it is the problem, if you have time, please take a look, thanks!

Best Regards,

-Ling

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