Re: [U-Boot] da850/L138 SPI flash transfer speed

2010-05-04 Thread Delio Brignoli
Hello Sekhar, Thank you for the advice below and sorry for the late reply; I have been offline for a week and I am catching up with my correspondence only now. El 26/04/2010, a las 13:56, Nori, Sekhar escribió: [...] > The only delays being configured in the driver are the > chip-select hold time

Re: [U-Boot] da850/L138 SPI flash transfer speed

2010-04-26 Thread Nori, Sekhar
On Sat, Apr 24, 2010 at 03:59:22, Wolfgang Denk wrote: > Dear Delio Brignoli, > > please mind the NetiQuette and restrict your line length to some 70 > charatcers or so. Thanks. > > In message <4d573595-069a-4490-af2d-38ed3aad7...@audioscience.com> you wrote: > > > > I am working on reducing boot

Re: [U-Boot] da850/L138 SPI flash transfer speed

2010-04-26 Thread Alessandro Rubini
>> To you knowledge, would enabling the >> cache for davinci da850 break anything in U-Boot? > > No, except that it should be done consistently for all ARM processors. Which reminds me I have to post V2 of my cache patch. V1 was sent on 2010-01-26 and some flush was missing. I didn't notice as ne

Re: [U-Boot] da850/L138 SPI flash transfer speed

2010-04-26 Thread Nori, Sekhar
Hello Delio, On Sat, Apr 24, 2010 at 05:00:49, Delio Brignoli wrote: > Hello Wolfgang, > > On 24/04/2010, at 10:29 AM, Wolfgang Denk wrote: > > please mind the NetiQuette and restrict your line length to some 70 > > charatcers or so. Thanks. > > Will do, thanks. > > > Everything is slow as caches

Re: [U-Boot] da850/L138 SPI flash transfer speed

2010-04-23 Thread Delio Brignoli
On 24/04/2010, at 11:42 AM, Wolfgang Denk wrote: > In message you wrote: >> >> OK, so reducing the number of reads from registers and writes to RAM >> should improve performance. To you knowledge, would enabling the >> cache for davinci da850 break anything in U-Boot? > > No, except that it shou

Re: [U-Boot] da850/L138 SPI flash transfer speed

2010-04-23 Thread Wolfgang Denk
Dear Delio Brignoli, In message you wrote: > > OK, so reducing the number of reads from registers and writes to RAM > should improve performance. To you knowledge, would enabling the > cache for davinci da850 break anything in U-Boot? No, except that it should be done consistently for all ARM p

Re: [U-Boot] da850/L138 SPI flash transfer speed

2010-04-23 Thread Delio Brignoli
Hello Wolfgang, On 24/04/2010, at 10:29 AM, Wolfgang Denk wrote: > please mind the NetiQuette and restrict your line length to some 70 > charatcers or so. Thanks. Will do, thanks. > Everything is slow as caches are not enabled. OK, so reducing the number of reads from registers and writes to R

Re: [U-Boot] da850/L138 SPI flash transfer speed

2010-04-23 Thread Wolfgang Denk
Dear Delio Brignoli, please mind the NetiQuette and restrict your line length to some 70 charatcers or so. Thanks. In message <4d573595-069a-4490-af2d-38ed3aad7...@audioscience.com> you wrote: > > I am working on reducing boot time on an L138 EVM and SPI flash transfer > speed is currently the

[U-Boot] da850/L138 SPI flash transfer speed

2010-04-23 Thread Delio Brignoli
Hello Sekhar, I am working on reducing boot time on an L138 EVM and SPI flash transfer speed is currently the worst offender. U-Boot transfers from the SPI flash at 0.6Mbytes/s, this a lot slower than I would expect for a 50MHz SPI clock. Using a scope we found that the chip select is active th