Hello Kim,
I actually work on an u-boot mpc8321 port (mostly identical with the kmeter1 port already in mainline), and I have to set the LCRR (Clock Ratio Register Reference Manual 10.3.1.14). As I see in
cpu/mpc83xx/cpu_init.c cpu_init_f()
this is done while running from flash. Hmm... the Reference manual says in chapter 10.3.1.14 page 474:
NOTE For proper operation of the system, this register setting must not be altered while local bus memories or devices are being accessed. Special care needs to be taken when running instructions from an local bus controller memory.
Hmm...
On my board (and for example on the MPC832XEMDS) the flash is connected to the localbus ... and this register setting is done, while running from flash ... Hmm.. is this safe?
I only can set the LCRR register succesfully on my board port, if I set the LCRR_DBYP bit in the CONFIG_SYS_LCRR define, without it I couldn;t run u-boot (with it, it works fine)
Unfortunately this LCRR_DBYP bit (0x80000000) is not documented in the MPC8323ERM ... there, it is just marked as reserved (and set to 1 on reset)
So, it is ok, just to set this LCRR_DBYP bit? Or should the LCRR register only changed, if u-boot runs from ram? Or ...?
bye Heiko