On Sunday, May 10, 2015 at 02:24:01 PM, Jagan Teki wrote: > On 10 May 2015 at 16:19, Pavel Machek <pa...@denx.de> wrote: > > On Sun 2015-05-10 11:15:41, Pavel Machek wrote: > > Add reset for N25Q256A SPI NOR, as U-Boot SPL 2013-socfpga (only > > version working on that board) sets 4-byte addressing mode. > > > > Signed-off-by: Pavel Machek <pa...@denx.de>
So, I took one more look into the datasheet [1]. With this chip, which is 128Mbit (16MByte), you don't even use 4-byte addressing so you don't care about it at all. But you actually do care about it if your hardware is broken and you use the N25Q256A [2] part. If the problem really is just between the U-Boot SPL and U-Boot (which I doubt btw), you can probably augment U-Boot such that it reads FSR (Flag Status Register, see page 27, table 17, bit 0). This bit tells you whether the part is in 3-byte or 4-byte mode and you can read this register in either mode. Same applies to N25Q512A [3], FSR bit 0 indicates the mode. [1] https://www.micron.com/~/media/documents/products/data-sheet/nor- flash/serial-nor/n25q/n25q_128mb_1_8v_65nm.pdf [2] https://www.micron.com/~/media/documents/products/data-sheet/nor- flash/serial-nor/n25q/n25q_256mb_3v_65nm.pdf [3] https://www.micron.com/~/media/documents/products/data-sheet/nor- flash/serial-nor/n25q/n25q_512mb_1ce_3v_65nm.pdf Best regards, Marek Vasut _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
