Hi Nikolaus,
Le dim., nov. 7 2021 at 14:47:43 +0100, H. Nikolaus Schaller
<hns@xxxxxxxxxxxxx> a écrit :
Hi Paul,
Am 09.10.2021 um 20:49 schrieb Paul Cercueil <paul@xxxxxxxxxxxxxxx>:
Hi,
Looks like NAND support has been broken on the JZ4740 SoC for a
while;
Yes, I remember someone telling that something was fundamentally
broken
and impossible to be fixed a while ago.
You mean MLC NAND, and that's still broken.
it looks like it comes from the fact that the "hw_oob_first"
mechanism
was dropped from the NAND core and moved to the Davinci driver.
It turns out the JZ4740 SoC needs it too; I didn't notice it when
writing the new ingenic-nand driver (to replace the old jz4740-nand
driver) most likely because my Device Tree had the "nand-ecc-mode"
set
to "hw_oob_first".
I am not very sure about patch [1/3]; to me the original code does
not
make sense, and it didn't work out-of-the-box on the JZ4740 without
it.
By applying patch [1/3] the function
nand_read_page_hwecc_oob_first()
can be reused for the JZ4740 SoC as well. But I did not test patch
[1/3]
on Davinci.
would this also work for jz4780 NAND?
The JZ4780 NAND driver does work, but UBI refuses to use the CI20's
NAND as it's a MLC.
-Paul
