Hi,
I'm trying to get linux-2.3.18 running on a MPC850 system; should
this be working, or should I better stick with embedded-2.2.5?
The main problem I'm strugging with is loading the initrd.
My modified boot loader works, the kernel starts and finds all para-
meters and memory, it finds the compressed initrd image, uncompresses
it, but then it does not run /linuxrc, nor can it find /init or
/bin/sh, so it crashes with `Kernel panic: No init found'.
The problem seems to be in drivers/block/rd.c: the gunzip in
crd_load() returns ok, so crd_load() return 0 to rd_load_image(),
where we `goto successful_load'. There infile.f_op->release points to
initrd_release(), which is called: it releases the initrd, sets
initrd_start=0, and this causes init/main.c to think there is no
initrd.
Any ideas what's going on here?
Another, less important question: this system has the console on
SMC2; there seem to be some bugs in the relevant code for a 850: the
following patch works for me - any comments?
--- uart.c.ORIG Tue Sep 14 19:23:43 1999
+++ uart.c Thu Sep 16 22:24:50 1999
@@ -47,7 +47,11 @@
/* this defines the index into rs_table for the port to use
*/
#ifndef CONFIG_SERIAL_CONSOLE_PORT
+# ifdef CONFIG_TQM850L
+#define CONFIG_SERIAL_CONSOLE_PORT 1 /* TQM850L uses SMC2 */
+# else
#define CONFIG_SERIAL_CONSOLE_PORT 0
+# endif
#endif
#endif
@@ -91,7 +95,7 @@
* want the SMC to work as a uart :-)..
* The "type" field is currently set to 0, for PORT_UNKNOWN. It is
* not currently used. I should probably use it to indicate the port
- * type of CMS or SCC.
+ * type of SMC or SCC.
* The SMCs do not support any modem control signals.
*/
#define smc_scc_num hub6
@@ -2360,13 +2364,24 @@
/* Configure SMCs Tx/Rx instead of port B parallel I/O.
*/
#if USE_SMC2
- cp->cp_pbpar |= 0x00000cc0;
+# ifdef CONFIG_MPC850
+ /* This will enable SMC1 and SMC2 Tx/Rx
+ */
+ immap->im_ioport.iop_papar |= 0x00C0;
+ immap->im_ioport.iop_padir &= ~0x00C0;
+ immap->im_ioport.iop_paodr &= ~0x00C0;
+ cp->cp_pbpar |= 0x000000c0;
+ cp->cp_pbdir &= ~0x000000c0;
+ cp->cp_pbodr &= ~0x000000c0;
+# else
+ cp->cp_pbpar |= 0x00000cc0;
cp->cp_pbdir &= ~0x00000cc0;
cp->cp_pbodr &= ~0x00000cc0;
+# endif
#else
/* This will only enable SMC1 if you want SMC2 for something else.
*/
- cp->cp_pbpar |= 0x000000c0;
+ cp->cp_pbpar |= 0x000000c0;
cp->cp_pbdir &= ~0x000000c0;
cp->cp_pbodr &= ~0x000000c0;
#endif
@@ -2374,13 +2389,13 @@
/* Configure SCC2 and SCC3 instead of port A parallel I/O.
*/
#if defined(CONFIG_MPC860) || defined(CONFIG_MPC860T)
-#ifndef CONFIG_MBX
+# ifndef CONFIG_MBX
/* The "standard" configuration through the 860.
*/
immap->im_ioport.iop_papar |= 0x003c;
immap->im_ioport.iop_padir &= ~0x003c;
immap->im_ioport.iop_paodr &= ~0x003c;
-#else
+# else
/* On the MBX, SCC3 is through Port D.
*/
immap->im_ioport.iop_papar |= 0x000c; /* SCC2 on port A */
@@ -2388,7 +2403,7 @@
immap->im_ioport.iop_paodr &= ~0x000c;
immap->im_ioport.iop_pdpar |= 0x0030; /* SCC3 on port D */
-#endif
+# endif /* CONFIG_MBX */
/* Since we don't yet do modem control, connect the port C pins
* as general purpose I/O. This will assert CTS and CD for the
@@ -2402,7 +2417,7 @@
*/
cp->cp_sicr &= ~0x00ffff00;
cp->cp_sicr |= 0x001b1200;
-#endif
+#endif /* CONFIG_MPC860, CONFIG_MPC860T */
/* Wire BRG1 to SMC1 and BRG2 to SMC2.
*/
@@ -2641,6 +2656,7 @@
volatile cpm8xx_t *cp;
volatile smc_t *sp;
volatile smc_uart_t *up;
+ volatile immap_t *immap;
#ifndef CONFIG_MBX
bd_t *bd;
@@ -2670,7 +2686,15 @@
* from dual port ram, and a character buffer area from host mem.
*/
up = (smc_uart_t *)&cp->cp_dparam[ser->port];
+#ifdef CONFIG_TQM850L
+ asm( "mfspr %0,638": "=r"(immap) : );
+
+ immap->im_ioport.iop_papar |= 0x00c0; /* Enable SMC2 */
+ immap->im_ioport.iop_padir &= ~0x00c0;
+ immap->im_ioport.iop_paodr &= ~0x00c0;
+#else
cp->cp_pbpar = 0x00c0; /* Enable SMC1 instead of Port B I/O */
+#endif
/* Allocate space for two buffer descriptors in the DP ram.
*/
@@ -2707,7 +2731,11 @@
/* Send the CPM an initialize command.
*/
+#ifdef CONFIG_TQM850L
+ cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_SMC2, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+#else
cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_SMC1, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+#endif
/*
* delay for a bit - this is necessary on my board!
* -- Cort
Wolfgang
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-4596-87 Fax: (+49)-8142-4596-88 Email: wd at denx.de
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