HELP! Memory mapping and address space doubts

[Jose França (Ext_GTBC)]

Vitaly,
 
     I'm using a linux 2.4.31 kernel. In the present situation I have BRx/ORx well configured and i can boot u-boot normally and without problems. I have a flash eprom with base address 0xD0000000 and a FPGA in 0xE0000000. In linux, i have the mtd driver similar to the rpxlite board. cfi_probe doesn't find my flash eprom. My colleague developped an fpga driver, but he can't access it either... It seem's that all the addresses that we try to access are all mixed-up. In ppc_md.map_io, i'm doing io_block_mapping for the CPM (from 0xf0000000 to the end of memory) , 0x80000000 and 0xa0000000 for PCI address space, both with 256MB of length. We are a bit lost... It seems that we forgot something to do. Can you help me on this?
 
 
Best regards,
Filipe.

	-----Mensagem original----- 
	De: linuxppc-embedded-bounces at ozlabs.org em nome de Vitaly Bordug 
	Enviada: sex 27-01-2006 13:37 
	Para: Jose França (Ext_GTBC) 
	Cc: linuxppc-embedded at ozlabs.org 
	Assunto: Re: HELP! Memory mapping and address space doubts
	
	

	Jose,
	Can you please be a bit more specific in targets you want to achieve?
	
	An example how to setup br/or and use the device could be found as a part of PQ2 PCI support,
	where interrupt controller is implemented as a CPLD device (arch/ppc/syslib/m82xx_pci.{c,h}).
	
	
	On Thu, 26 Jan 2006 14:04:49 -0000
	Jose França (Ext_GTBC) <Jose.Franca.Ext at siemens.com> wrote:
	
	> Hello u all!
	>
	>       I need to clarify some aspects of the memory management in ppc linux and i hope that you could help me.
	>       Lets imagine we have a mpc8272 based board with 3 devices A, B and C.In the bootloader (in my case, i use u-boot), i configured the BRx and Orx so that A has base address X, B has base address Y and C has base address Z. My first doubt arrises here: what address should i use? Being SDRAM base address 0x00000000 and kernel base address 0xC0000000, where will i put these devices mapped on? Above 0xC0000000 or in between the end of physical memory and 0xC0000000? Do i really need to configure the BAT registers in u boot?
	>       In linux 2.4 kernel, we have ppc_md.setup_io_mappings to map address blocks into the BAT registers... As i observed in the kernel source tree examples, we must map CPM (why?). And what about the other devices A, B and C? How will i setup them in this case and what addresses i can use? Above 0xC0000000 or in between the end of physical memory and 0xC0000000? Is the SDRAM included?
	>
	>       Thanks in advance to all contributions! All of them will be most welcomed!
	>
	>
	>
	>
	>
	> Best regards,
	> Filipe
	>
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	>
	
	
	--
	Sincerely,
	Vitaly
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