problems ..to boot linux 2.4.4 on fads mpc860 please help!!!!!!!!
Leonardo Pereira Santos
lsantos at pd3.com.br
Thu Nov 7 01:43:08 EST 2002
Hi there! I hope this helps...
First of all, a coleague managed to make a 850FADS board work properly, so the
credit is his. We're using PPCBoot 1.2 and kernel-2.4.20pre1. The first thing
is to make sure that the ppcboot environment variable "clocks_in_mhz" IS NOT
DEFINED. It would NOT exist, not be defined as 0 or 1. It changes the clock
dividers in the processor that is not good. This should make the kernel boot
at least with a ramdisk.
If you have trouble to make the ethernet interface work, as we did, you should
edit the include/asm-ppc/commproc.h and arch/ppc/platforms/fads.h files. In
the first file, you should add the following:
/*** FADS ********************************************************/
/* This ENET stuff is for the MPC850SAR with ethernet on SCC2. Some of
* this may be unique to the FADS850SAR configuration.
* Note TENA is on Port B.
#define PA_ENET_RXD ((ushort)0x0004) /* PA 13 */
#define PA_ENET_TXD ((ushort)0x0008) /* PA 12 */
#define PA_ENET_RCLK ((ushort)0x0200) /* PA 6 */
#define PA_ENET_TCLK ((ushort)0x0800) /* PA 4 */
#define PB_ENET_TENA ((uint)0x00002000) /* PB 18 */
#define PC_ENET_CLSN ((ushort)0x0040) /* PC 9 */
#define PC_ENET_RENA ((ushort)0x0080) /* PC 8 */
#define SICR_ENET_MASK ((uint)0x0000ff00)
#define SICR_ENET_CLKRT ((uint)0x00002f00) /* RCLK-CLK2, TCLK-CLK4 */
#endif /* CONFIG_FADS */
It should be put together with the other boards' definitions.
The fads.h file shoud be edited in these definitions:
< /*** defines taken from PPCBoot 1.2 ***/
< #define BCSR_ADDR ((uint) 0x02100000)
< #define BCSR_SIZE ((uint)(64 * 1024))
< #define BCSR0 ((uint) (BCSR_ADDR + 00))
< #define BCSR1 ((uint) (BCSR_ADDR + 0x04))
< #define BCSR2 ((uint) (BCSR_ADDR + 0x08))
< #define BCSR3 ((uint) (BCSR_ADDR + 0x0c))
< #define BCSR4 ((uint) (BCSR_ADDR + 0x10))
< /*** ***/
That should do the trick. Again, we are using a FADS850SAR board, which is not
the same you have, but the spirit of the whole thing is to take the info from
a working ppcboot to the kernel. Hope it helps.
"All things are ready, if our minds be so"
The Life Of King Henry V - William Sharespeare
Leonardo Pereira Santos
Engenheiro de Projetos
av. Pará 330/202
(51) 3337 1237
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
More information about the Linuxppc-embedded