From 5de3b9b7263196b1d2bf41659ca44c7ea386b8ab Mon Sep 17 00:00:00 2001 From: Boris Baykov Date: Sat, 11 Jun 2016 18:29:02 +0200 Subject: 4BA: Support for 4-bytes addressing via Extended Address Register MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On some flash chips data with addresses more than 24-bit field can address may be accessed by using Extended Address Register. The register has 1-byte size and stores high byte of 32-bit address. Then flash can be read from 3-bytes addressing mode with writing high byte of address to this Register. By using this way we have access to full memory of a chip. Some chips may support this method only. This patch provides code use Extended Address Register. Patched files ------------- chipdrivers.h + added functions declarations for spi4ba.c flash.h + feature definitions added flashrom.c + modified switch to 4-bytes addressing to support extended address register spi4ba.h + definitions for 4-bytes addressing JEDEC commands + functions declarations from spi4ba.c (same as in chipdrivers.h, just to see) spi4ba.c + functions for write Extended Address Register + functions for read/write/erase with Extended Address Register Change-Id: I09a8aa11de2ca14901f142c67c83c4fa0def4e27 Signed-off-by: Boris Baykov , Russia, Jan 2014 [clg: ported from https://www.flashrom.org/pipermail/flashrom/2015-January/013200.html ] Signed-off-by: Cédric Le Goater Reviewed-on: https://review.coreboot.org/20507 Tested-by: build bot (Jenkins) Reviewed-by: Nico Huber --- chipdrivers.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'chipdrivers.h') diff --git a/chipdrivers.h b/chipdrivers.h index dccd1ff9..a3da8657 100644 --- a/chipdrivers.h +++ b/chipdrivers.h @@ -204,5 +204,11 @@ int spi_nbyte_read_4ba(struct flashctx *flash, unsigned int addr, uint8_t *bytes int spi_block_erase_20_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen); int spi_block_erase_52_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen); int spi_block_erase_d8_4ba(struct flashctx *flash, unsigned int addr, unsigned int blocklen); +int spi_byte_program_4ba_ereg(struct flashctx *flash, unsigned int addr, uint8_t databyte); +int spi_nbyte_program_4ba_ereg(struct flashctx *flash, unsigned int addr, const uint8_t *bytes, unsigned int len); +int spi_nbyte_read_4ba_ereg(struct flashctx *flash, unsigned int addr, uint8_t *bytes, unsigned int len); +int spi_block_erase_20_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen); +int spi_block_erase_52_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen); +int spi_block_erase_d8_4ba_ereg(struct flashctx *flash, unsigned int addr, unsigned int blocklen); #endif /* !__CHIPDRIVERS_H__ */ -- cgit v1.2.3