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Re: Regd. the MMU in eCos1.3.1
- From: Andrew Lunn <andrew dot lunn at ascom dot ch>
- To: Prabal Halder <prabal at cdotd dot ernet dot in>
- Cc: eCos Disuss <ecos-discuss at sources dot redhat dot com>
- Date: Thu, 3 Apr 2003 12:36:03 +0200
- Subject: [ECOS] Re: Regd. the MMU in eCos1.3.1
- References: <Pine.OSF.4.21.0304031451460.17565-100000@libra.cdotd.ernet.in>
Please remember to send to eCos discuss and not the individuals.
On Thu, Apr 03, 2003 at 03:08:12PM +0500, Prabal Halder wrote:
>
> We are using eCos1.3.1 in our project. We have been facing problem
> with MMU.
1.3.1 is long dead. I don't have it installed any more. The files i
refer to be low are from anoncvs.
> According to my understanding, the cyg_hal_mem_map[] array is used to
> store the memory mapping. Which will be stored in the I & D Cache
> (in TLB) in the following function.
[..]
> In cyg_hal_map_memory(...) call we are passing the virtual address,
> physical address, flags & size of the structure "cyg_hal_mem_map[]". But
> in the ecos source code, I have not found the initialization of this
> structure.
>
> Please tell me, which is the place to initialize this structure and
> how to do it.
hal/powerpc/arch/current/include/hal_mem.h:107
#define CYGARC_MEMDESC_TABLE cyg_memdesc_t cyg_hal_mem_map[]
./powerpc/viper/current/src/hal_aux.c:64
// The memory map is weakly defined, allowing the application to redefine
// it if necessary. The regions defined below are the minimum requirements.
CYGARC_MEMDESC_TABLE CYGBLD_ATTRIB_WEAK = {
// Mapping for the Viper 855/860 development boards
CYGARC_MEMDESC_CACHE( 0xfe000000, 0x00800000 ), // ROM region
CYGARC_MEMDESC_NOCACHE( 0xff000000, 0x00100000 ), // MCP registers
CYGARC_MEMDESC_NOCACHE( 0xfa000000, 0x00400000 ), // Control/Status+LEDs
CYGARC_MEMDESC_CACHE( CYGMEM_REGION_ram, CYGMEM_REGION_ram_SIZE ), // Main
memory
CYGARC_MEMDESC_TABLE_END
};
Something similar exists for all PPC HALS.
Andrew
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