[U-Boot-Users] value of r4 in start.S in boot_cold?

[Nghiem, Tien]

Prathima,
 
The address 0x0F010000 is the base address. It gives you the acess to the internal memory register. Example:
 
 
The BR0's address = 0x0F010000 +  100
The OR0's address = 0x0F010000 +  104......
 
Tien Nghiem
-----Original Message-----
From: u-boot-users-admin at lists.sourceforge.net [mailto:u-boot-users-admin at lists.sourceforge.net]On Behalf Of Prathima_Kolar
Sent: Tuesday, September 28, 2004 8:09 AM
To: 'U-Boot-Users at lists.sourceforge.net'
Cc: Nishant_Galange; Apoorv_Sangal; Lochana_Lingegowda
Subject: [U-Boot-Users] value of r4 in start.S in boot_cold?


Hello,
I am not able to figure out the content of register r4 in the given code snippet.
I also wanted to know the significance of the address 0x 0F010000 got from the line "lwz     r4, 0(r3)".
 
boot_cold:
#if defined(CONFIG_MPC8260ADS)
            lis         r3, CFG_DEFAULT_IMMR at h
            nop
            lwz       r4, 0(r3)
            nop
            rlwinm  r4, r4, 0, 8, 5
            nop
            oris       r4, r4, 0x0200
            nop
            stw       r4, 0(r3)
            nop
 
Thanks & Warm Regards,
Prathima.
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