Hi,
Thank you for your reply.
Flash is=20
HY27US(08/16)12(1/2)B Series
512Mbit (64Mx8bit / 32Mx16bit) NAND Flash
and you are probably right.
It seems to be a block structured device.

Further in a log I found out

BrcmNAND mfg ad 76 Hynix HY27US08121A (dream) 64MB

Found NAND: ACC=3D00000000, cfg=3D04042300, flashId=3Dad76ad76, tim1=3D5363=
444f,=20
tim2=3D00000fc6
BrcmNAND version =3D 0x0001 64MB @00000000
Found NAND chip on Chip Select 1, chipSize=3D64MB, usable size=3D64MB, base=
=3D14000000
ACC_CONTROL B4: 00000000
ACC_CONTROL after: 20000000
age_shift=3D9, bbt_erase_shift=3D14, chip_shift=3D26, phys_erase_shift=3D14
rcm NAND controller version =3D 0.1 NAND flash size 64MB @14000000
td->oobsize=3D16, mtd->eccOobSize=3D16
rcmnand_scan:  mtd->oobsize=3D16
rcmnand_scan: oobavail=3D12, eccsize=3D512, writesize=3D512
rcmnand_scan, eccsize=3D512, writesize=3D512, eccsteps=3D1, ecclevel=3D15, =
eccbytes=3D3
brcmnand_default_bbt: bbt_td =3D bbt_main_descr
 Bad block table found at page 1ffe0, version 0x01
 Bad block table found at page 1ffc0, version 0x01
rcmnandCET: Status -> Deferred
numchips=3D1, size=3D4000000
 Creating 4 MTD partitions on "bcm7xxx-nand.0":
 0x0000000000000000-0x0000000004000000 : "complete"
 0x0000000000000000-0x0000000000040000 : "loader"
 0x0000000000040000-0x0000000000400000 : "boot partition"
 0x0000000000400000-0x0000000004000000 : "root partition"


>=20
> You indicated that the flash was the device the OS is located on, so it i=
s
> a block structured device.  While block structured devices can, and
> sometimes are, implemented in memory, it probably wouldn't make sense for
> the OS.  More likely it is SPI flash.
>=20

> I believe you also indicated (although I couldn't find the reference) tha=
t
> the flash was an SD card.
NO, the flash is one of the HY27US(08/16)12(1/2)B Series see above

>=20

>=20
> Since you have no RAM other than the SDRAM, that almost certainly starts
> at zero and extends for as much as you have, unless, of course, you have
> memory on the processor (as in a PIC).
Can you please explain a little more what you mean by
"extends for as much as you have"

Do you mean that if the SDRAM has=20
Density: 512M bits
and there are 4 modules e.g.
16M words =D7 8 bits =D7 4 banks (EDD5108AGTA)
or=20
 8M words =D7 16 bits =D7 4 banks
I can expect=20
SDRAM has 512MB and memory range is from
0  upto 1024x1024x512  that is
from 0x0 upto 0x51200000=20
(in hexadecimal notation)

?

But where is the  BIOS then? Above the SDRAM?
BIOS is 4 Mbit (512Kb x 8) Low Voltage UV EPROM

Thanks again for help
L.

>=20
> --McD
>=20
>=20
> --=20
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