[U-Boot-Users] I-cache and D-cache size problem on MPC859
wd at denx.de
Mon Nov 14 14:33:15 CET 2005
In message <69DF49BE936F4441980EC1D59F0ADC2F010ADC04 at aqlby02a.siemens.it> you wrote:
> Now I have the U-Boot for MPC859, but I am not sure this line is correct
> U-Boot 1.1.3 (Nov 11 2005 - 16:38:24)
> CPU: MPC859TxxZPnnA at 133 MHz: 16 kB I-Cache 8 kB D-Cache FEC present
Looks good to me.
> As far as I know, the I-Cache and the D-Cache of the MPC859 is 4 kB, as
> defined in the MPC866UM Appendix F.
Well, if you follow the Parametrics sheets on the freescale pages the
size is not 4 KiB (= 4096 Bytes), but 4000 Bytes instead. Looks bogus
> We think that the MPC859 probably has phisically the same cache size as the
> MPC866, but only 4 kB must be used.
U-Boot uses the functions checkicache() and checkdcache() [see
"cpu/mpc8xx/cpu.c"] to measure the size of the L1 instruction and
> Anyway, my question is, must I worry about the data printed on the screen or
> can I leave as they are?
I don't see how you could change the sizes.
> I mean, are these information used in other part of the U-Boot or the
They are just informational messages.
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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