From mboxrd@z Thu Jan 1 00:00:00 1970 From: pavel@ucw.cz (Pavel Machek) Date: Mon, 4 Sep 2017 18:26:02 +0200 Subject: [PATCH 1/2] mtd: spi-nor: add an option to force 3byte adressing mode In-Reply-To: <1503954854-30963-2-git-send-email-mw@semihalf.com> References: <1503954854-30963-1-git-send-email-mw@semihalf.com> <1503954854-30963-2-git-send-email-mw@semihalf.com> Message-ID: <20170904162602.GC21849@amd> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi! > index 1413828..029c87d 100644 > --- a/drivers/mtd/spi-nor/spi-nor.c > +++ b/drivers/mtd/spi-nor/spi-nor.c > @@ -2002,7 +2002,17 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, > if (JEDEC_MFR(info) == SNOR_MFR_SPANSION || > info->flags & SPI_NOR_4B_OPCODES) > spi_nor_set_4byte_opcodes(nor, info); > - else > + else if (of_property_read_bool(np, "spi-3byte-addressing")) { > + /* > + * Do not enter 4byte mode in order to prevent > + * the early bootloader to come up on non-default > + * SPI NOR memory during boot. Limit accessible > + * size to 16MiB. > + */ > + nor->addr_width = 3; > + mtd->size = 0x1000000; > + dev_info(dev, "Force 3B addressing mode\n"); I'd append "limiting access to first 16MiB" .. because otherwise people will wonder where their flash went. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 181 bytes Desc: Digital signature URL: