[U-Boot-Users] Using the abatron to debug an image in flash

[Mark Doherty]

Dear Wolfgang, 

> Accessing normal static variables should be  no  problem.  It's  just
> initialized  data  pointers  which  need  manual relocation. I try to
> avoid this data type whenever possible, or we need to relocate it. If
> you find unrelocated initialized pointers please let me know.
> 
> But accessing the variables itself should work just fine  -  if  they
> are pointers, they will just contain unrelocated addresses.
> 

I have loaded the symbol file as mentioned previously, however to my 
unexperienced eye it appears that some of the symbols for the static 
variables have not been loaded where I would have expected ...

$ ppc-linux-gdb
GNU gdb 5.1.1
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=i386-redhat-linux --target=ppc-linux".
(gdb) bdi
0xff000100 in ?? ()
(gdb) ram
add symbol table from file "u-boot" at
        .text_addr = 0x7fc0000
(gdb) info address rtx
Symbol "rtx" is static storage at address 0xff0312d8.
(gdb)

In the unlikely case you are not aware rtx is defined in 
cpu/mpc8260/ether_fcc.c as ...

<snip>
/*
 * FCC Ethernet Tx and Rx buffer descriptors.
 * Provide for Double Buffering
 * Note: PKTBUFSRX is defined in net.h
 */

typedef volatile struct rtxbd {
    cbd_t rxbd[PKTBUFSRX];
    cbd_t txbd[TX_BUF_CNT];
} RTXBD;

/*  Good news: the FCC supports external BDs! */
#ifdef __GNUC__
static RTXBD rtx __attribute__ ((aligned(8)));
#else
#error "rtx must be 64-bit aligned"
#endif
<snip>

Is this what you would normally expect? When I scan the assembler the code 
uses the correct address, it appears that the gdb however is a bit lost.

Best wishes,

Mark.