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Code

allow using 2GB nand and ignore 'valid'-bits

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This commit is contained in:
Bas Wijnen 2010-10-12 19:29:58 +02:00
parent 90186ce7ce
commit 8d5e29095e
1 changed files with 18 additions and 44 deletions
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62
mips/nand.hhp
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@ -134,7 +134,7 @@ static bool read (unsigned a, char *buffer):
// 33: 9-byte ecc of 4th 512 bytes
// 42: unused
// 64: end of space
unsigned col = (1 << page_bits) + 2
unsigned col = (1 << page_bits) + 6 + 9 * (column >> 9)
cmd (CMD_READ0)
addr (col)
addr (col >> 8)
@ -142,21 +142,6 @@ static bool read (unsigned a, char *buffer):
addr (row >> 8)
addr (row >> 16)
cmd (CMD_READSTART)
bool valid = false
for unsigned t = 0; t < 3; ++t:
if rdata () == 0:
valid = true
break
if !valid:
//debug ("invalid page for nand read: %x\n", a)
for unsigned i = 0; i < 1 << (9 - 2); ++i:
((unsigned *)buffer)[i] = ~0
return false
col = (1 << page_bits) + 6 + 9 * (column >> 9)
cmd (CMD_RNDOUT)
addr (col)
addr (col >> 8)
cmd (CMD_RNDOUTSTART)
//debug ("parity data:")
for unsigned t = 0; t < 9; ++t:
error[t] = rdata ()
@ -192,17 +177,18 @@ static bool read (unsigned a, char *buffer):
data ^= mask << offset
buffer[byte] = data
buffer[byte + 1] = data >> 8
#if 0
for unsigned i = 0; i < 0x10; ++i:
if (buffer[i] & 0xff) < 0x10:
//debug (" 0")
debug (" 0")
else:
//debug (" ")
//debug ("%x", buffer[i] & 0xff)
//debug ("\n")
debug (" ")
debug ("%x", buffer[i] & 0xff)
debug ("\n")
#endif
return true
static void write (unsigned a, char *buffer):
dbgl ()
unsigned row = a >> page_bits
//debug ("writing: %x/%x\n", a, row)
cmd (CMD_SEQIN)
@ -211,10 +197,8 @@ static void write (unsigned a, char *buffer):
addr (row)
addr (row >> 8)
addr (row >> 16)
char ecc[4][12]
dbgl ()
for unsigned i = 0; i < 0x4; ++i:
dbgl ()
char ecc[8][12]
for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
bool all_ff = true
EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_ENCODING | EMC_NFECR_ERST
//debug ("writing data from %x\n", (unsigned)buffer + i * 0x200)
@ -225,19 +209,15 @@ static void write (unsigned a, char *buffer):
if !all_ff:
while !(EMC_NFINTS & EMC_NFINTS_ENCF):
DELAY ()
dbgl ()
for unsigned t = 0; t < 9; ++t:
ecc[i][t] = ((volatile char *)&EMC_NFPAR (0))[t]
dbgl ()
//debug ("parity for %x:", i * 0x200 + a)
//for unsigned t = 0; t < 9; ++t:
//debug (" %x", ecc[i][t] & 0xff)
//kdebug ("\n")
else:
dbgl ()
for unsigned t = 0; t < 9; ++t:
ecc[i][t] = 0xff
dbgl ()
// Spare space (starts at 1 << page_bits)
// 0: unused
// 2: detect valid data (at least 1 byte == 0 means valid)
@ -250,14 +230,12 @@ static void write (unsigned a, char *buffer):
// 64: end of space
for unsigned i = 0; i < 6; ++i:
wdata (0)
for unsigned i = 0; i < 4; ++i:
for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
for unsigned j = 0; j < 9; ++j:
wdata (ecc[i][j])
dbgl ()
cmd (CMD_PAGEPROG)
// Wait at least 100 ns.
DELAY ()
dbgl ()
cmd (CMD_READ0)
addr (0)
addr (0)
@ -265,9 +243,7 @@ static void write (unsigned a, char *buffer):
addr (row >> 8)
addr (row >> 16)
cmd (CMD_READSTART)
dbgl ()
for unsigned i = 0; i < 4; ++i:
dbgl ()
for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
EMC_NFINTS = 0
EMC_NFECR = EMC_NFECR_ECCE | EMC_NFECR_RS | EMC_NFECR_RS_DECODING | EMC_NFECR_ERST
for unsigned t = 0; t < 0x200; ++t:
@ -292,26 +268,24 @@ static void write (unsigned a, char *buffer):
unsigned offset= bit & 7
unsigned byte = bit / 8
debug ("error detected by parity: %x on %x+%d\n", mask, byte, offset)
dbgl ()
for unsigned i = 0; i < 6; ++i:
if rdata () != 0:
debug ("extra data not 0 at byte %d\n", i)
dbgl ()
for unsigned i = 0; i < 4; ++i:
for unsigned i = 0; i < 1 << (page_bits - 9); ++i:
for unsigned j = 0; j < 9; ++j:
unsigned r = rdata () & 0xff
if r != (ecc[i][j] & 0xff):
debug ("ecc doesn't match: %x != %x\n", r, ecc[i][j] & 0xff)
dbgl ()
//debug ("nand program %x:", a)
#if 0
for unsigned i = 0; i < 0x10; ++i:
if (buffer[i] & 0xff) < 0x10:
//debug (" 0")
debug (" 0")
else:
//debug (" ")
//debug ("%x", buffer[i] & 0xff)
dbgl ()
//debug ("\n")
debug (" ")
debug ("%x", buffer[i] & 0xff)
debug ("\n")
#endif
static void erase (unsigned a):
unsigned row = a >> page_bits