I don't know if it's related, but I had an issue with the u-boot-1.1.1 when using 32MB SDRAM with a MPC5200.
In the initdram function in icecube.c, the sdram_start is properly set to 0 after detection 32MB for CS0. But when trying to detect mem with CS1, and if there is no mem, the sdram_start is set to 1 and then improperly set the high_bit to 1 in the MPC5XXX_SDRAM_CTRL register.
/* find RAM size using SDRAM CS1 only */ sdram_start(0); test1 = get_ram_size((ulong *)(CFG_SDRAM_BASE + dramsize), 0x80000000); sdram_start(1); test2 = get_ram_size((ulong *)(CFG_SDRAM_BASE + dramsize), 0x80000000); if (test1 > test2) { sdram_start(0); dramsize2 = test1; } else { dramsize2 = test2; }
if no mem, test1==test2 and then sdram_start(1) is kept set. Or the previous test for CS0, which properly detected 32MB, set up sdram_start(0) correctly.
I haven't had time to figure a clean fix, so I did a dirty hack:
// FIXME if( dramsize==(32*1024*1024) ) { sdram_start(0); } else if( dramsize==(64*1024*1024) ) { sdram_start(1); } printf("SDRAM_CTRL=0x%x\n",*(vu_long *)MPC5XXX_SDRAM_CTRL);
Bertrand
Le Vendredi 07 Janvier 2005 10:32, Giorgio Delmondo a écrit :
Hi, I designed an MPC5200 with 256MB RAM (4 x 512Mb chips; MT48LC32M16A2, 8x16bitx4banks). When I force U-boot to just use the first 128 MB, everything is ok (I force the return value from the routine exploring the RAM size). If I try to use the full 256 MB it crashes in the relocation phase (not always at the same point). I'm quite sure the RAM is working, as a test RAM program, residing in the low RAM and testing the full memory from 0x08000000 to 0x0fffffff, always gives result ok (it's started from U-boot running in low memory). I'm using u-boot 1.1.1
Any suggestion?
Many thanks
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