Re: [ts-7000] Dynamic frequency changing

[Curtis Monroe <>]

There is code in the TS-BOOTROM to set the clock:
I found this there:


        mov     ip, sp
        cmp     r0, #6  ; 0x6
        stmdb   sp!, {fp, ip, lr, pc}
        ldr     r1, =0x02b0b3b6
        sub     fp, ip, #0x4
        bls     LABEL1
        ldr     r3, =0x8001438c
        mov     r2, #0x7
        str     r2, [r3]
        ldr     r3, =0x80014388
        mov     r2, #0x2
        str     r2, [r3]
        b       LABEL2

LABEL1:
        ldr     r2, =0x8001438c
        movne   r3, #0x5
        ldr     ip, =0x80014388
        ldr     r1, =0x02a0bb36
        moveq   r3, #0x3
        strne   r3, [r2]
        ldrne   r1, =0x02b09a2f
        movne   r3, #1  ; 0x1
        streq   r0, [r2]
        streq   r3, [ip]
        strne   r3, [ip]

LABEL2
        orr     r1, r1, #262144 ; 0x40000

        ldr     r2, [pc, #116]  ; 0xb38 ; 0x809300c0
        mov     r3, #170        ; 0xaa
        str     r3, [r2]        ; unlock syscon

        ldr     r3, [pc, #108]  ; 0xb3c ; 0x80930020
        str     r1, [r3]        ; set clock speed

        nop                     ; 5 NOPs to flush
        nop                     
        nop                     
        nop                     
        nop                     

        // Set MMU to Asyncronous
        mrc     15, 0, r0, cr1, cr0, {0}
        orr     r0, r0, #0xc0000000
        mcr     15, 0, r0, cr1, cr0, {0}

        nop
        nop
        nop
        nop
        nop

        ldr     r2, =0x80930024
        ldr     r3, =0x300dc317
        str     r3, [r2]
        mov     r0, #1000 
        ldr     r3, =0x60000e18
        mov     lr, pc
        mov     pc, r3                  ; gosub delay (1msec)
        ldmdb   fp, {fp, sp, pc}        ; return


-Curtis.


On Tue, 2005-06-28 at 17:10, Bob Lees wrote:
> Hi All
> 
> Has anyone got dynamic frequency changing working a la cpufreq or
> similar?
> 
> I have found Jim's cctl which works from userland, but doesn't adjust 
> loops_per_jiffy (it's in userland so doesn't have access).  Very
> useful for 
> tweaking all sorts of things, thanks Jim.
> 
> Also I can't find anywhere in the init code which sets the TS72x0 clk 
> registers, etc.  Is this only done in Redboot or am I being dense:(
> 
> Thanx
> 
> Bob
> -- 
> V +44 (0) 1296 747667
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